Azure AI Document Intelligence invoice analysis fails with unexpected error for all PDF files

Question

Azure AI Document Intelligence invoice analysis fails with unexpected error for all PDF files

Palacký Martin 0

Hello,

We are experiencing an issue with Azure AI Document Intelligence. When using the prebuilt Invoice model, analysis fails for every PDF invoice we test in the Azure portal Test tab. Error shown: "Analysis failed. Failed to analyze the file. An unexpected error occurred."

Details:

Service: Azure AI Document Intelligence
Model: Prebuilt Invoice
Happens for all invoice PDF files, not just one document
Occurs directly in Azure portal during testing

Could you please confirm whether this is a known service issue or if there is a problem with the Document Intelligence service configuration?

Thank you.

Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-19T19:03:41.5833333+00:00

Hello @Palacký Martin

Just checking in to see if the above response was helpful

Thank you
Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-20T19:29:14.2066667+00:00

Hello @Palacký Martin ,

Checking in to know if you had a chance to review the above response

Thank you
Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-21T19:10:35.0433333+00:00

Hello @Palacký Martin ,

Hope the response was helpful.

Since I’ve converted my earlier comment into an answer, could you please take a moment to mark it as Accepted with an upvote? This helps others in the community with the same question find the solution more easily.

Thank you!

2 answers

Your answer

Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-19T19:03:41.5833333+00:00

Hello @Palacký Martin

Just checking in to see if the above response was helpful

Thank you
Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-20T19:29:14.2066667+00:00

Hello @Palacký Martin ,

Checking in to know if you had a chance to review the above response

Thank you
Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-21T19:10:35.0433333+00:00

Hello @Palacký Martin ,

Hope the response was helpful.

Since I’ve converted my earlier comment into an answer, could you please take a moment to mark it as Accepted with an upvote? This helps others in the community with the same question find the solution more easily.

Thank you!

Answer 1

Hello,

First of all, I apologize for the late reply. I missed it.

Thank you for your response and for the suggested troubleshooting steps.

I checked Azure Service Health, but I did not find any active incident or service degradation related to this issue.

The issue started suddenly from one day to the next. The same setup and the same type of invoice documents had been working normally before.

There was only a very minor change on our side: we corrected a typo in the description of the specific field that the model extracts. This was only a description correction and should not have changed the document structure, field definition, or extraction logic.

I would also like to clarify that when using the API, the latest build before this update still works normally with the same documents. This suggests that the issue is unlikely to be caused by file upload, PDF corruption, encryption, or the general document format.

I apologize, but I have not yet had time to test other prebuilt models such as prebuilt-layout or prebuilt-read, and I have not performed cross-region testing yet. However, for our use case we specifically need this custom invoice model, so testing other models or regions would mainly help isolate the issue, but would not be a practical replacement for our production workflow.

Could you advise whether correcting a typo in a field description could impact the model analysis stage, or whether there is a way to restore/continue using the previous working build?

Thank you.

Best regards,

Martin

Karnam Venkata Rajeswari 4,515 Reputation points Microsoft External Staff Moderator

2026-05-21T20:02:18.02+00:00

Hello @Palacký Martin ,

Thank you for sharing the detailed update.

Please allow us sometime while we work on providing the suggestions

Thank you

Answer 2

Karnam Venkata Rajeswari 4,515 Microsoft External Staff Moderator

Hello @Palacký Martin

Welcome to Microsoft Q&A .Thank you for reaching out to us.

Thank you for sharing the detailed information and screenshot regarding the issue observed with the prebuilt Invoice model in Azure AI Document Intelligence.

Based on the behavior described, the document upload and preview in the portal Test tab appear to be functioning as expected. However, the failure occurs during the document analysis stage with the message:

“Analysis failed. Failed to analyze the file. An unexpected error occurred.”

This indicates that the issue is likely occurring during backend processing rather than during file ingestion. Considering that the same behavior is reproducible across multiple PDF invoices, the scenario may be influenced by a combination of service conditions, model behavior or input characteristics.

The observed behavior may be associated with one or more of the following:

Temporary backend processing issue or service degradation
Region-specific or model-specific performance limitations
Input document characteristics affecting analysis
Portal-specific limitations or transient UI behavior

Please check if the following steps helps -

Validating Service Health and Regional Status
1. Review the current service status on
  - Azure Status
  - Azure Service Health
2. This helps identify any regional or service-wide incidents impacting processing.
Isolating model vs service scope Please test additional models within the same resource:
- prebuilt-layout
- prebuilt-read
If these models succeed while Invoice fails, the issue is likely model-specific, else the issue may be service-level or configuration-related.
Validating via REST API or SDK Consider executing the same PDF using REST API or SDK to check backend response details
1. If the API succeeds but portal fails - Portal/UI limitation or transient issue
2. If the API fails with same error - Backend, document, or configuration issue
Validating Input PDF Characteristics Even when multiple files fail, validating input properties remains important:
- Ensure PDF is:
- Not encrypted or password-protected
- Not corrupted
- Confirm document meets supported limits:
- Up to 500 MB and 2000 pages (Standard tier)
- Please verify:
- Single-invoice vs multi-invoice structure
- Scanned vs digitally generated PDFs
Validating region and deployment setup
1. Please confirm the resource is deployed in a supported region
2. Prebuilt models rely on regional availability and supported configurations
Performing Cross-Region Testing Consider deploying a temporary resource in another region and retest the same PDFs If issue is not reproducible - likely region-specific behavior If issue persists - broader service or input-related condition

The following references might be helpful , please check them out

Please let us know if the response was helpful

Thank you

Manas M 17,270 Reputation points Moderator

2026-06-01T08:21:28.0266667+00:00

Hello @Palacký Martin

Hope you found above inputs helpful

I would emphasize on file type/extension instead.

You can start with sample files here to isolate the issue rising from file type or size.

Attached Relevant document on type /size limit for you.

Thank you.
Martin Buroň 10 Reputation points

2026-06-10T13:40:13.4433333+00:00
Hello,

I tested the analysis again today.

Martin Palacký, who has been communicating on this thread, is my colleague. We are working on the same project, but he is currently on vacation, so I am following up on the investigation and testing on his behalf.

This time the behavior was different: the operation did not fail immediately with the previous "unexpected error" message. Instead, the Analyze operation kept running for a long time and eventually ended with a timeout.

The issue is still reproducible and is affecting invoice analysis. Since the processing takes an unusually long time before timing out, it appears the request is being accepted by the service but not completed successfully.

Could you please check whether there are any ongoing service-side issues, performance degradation, or backend incidents affecting Document Intelligence invoice analysis in this region?

If needed, I can provide additional details such as:

Resource region

Timestamp of the failed request

API version

Operation ID / Correlation ID

Sample document used for testing

Thank you.
Manas M 17,270 Reputation points Moderator

2026-06-11T01:26:46.3766667+00:00

Hey Martin Buroň

Please share your team's email for quick connect.

Have reached on private message for the same.

Thank you.
Martin Buroň 10 Reputation points

2026-06-11T06:03:57.2333333+00:00

Hello @Manas M

team e-mail is <REDACTED at support side>

Thank you.
Martin Buroň 10 Reputation points

2026-06-12T07:37:13.5766667+00:00

Thank you for your response.

Unfortunately, I have not received any private message from you. Could you please resend it, or alternatively provide the information here in the thread?

Thank you.
Manas M 17,270 Reputation points Moderator

2026-06-12T10:56:16.7766667+00:00

Hey Martin Buroň

I have reached you again on private message

Thank you for following up.
Martin Buroň 10 Reputation points

2026-06-12T11:05:57.54+00:00

Hello,

Thank you for your follow-up. Unfortunately, I still cannot find any private message in my Microsoft Learn account.

If the message was sent to our team account (development), please note that it is only an email distribution group and cannot be used to sign in to Microsoft Learn or access private messages.

Could you please verify which account the message was sent to, or provide an alternative way to contact you?

Thank you.
Martin Buroň 10 Reputation points

2026-06-15T08:15:22.3766667+00:00

I haven't received any private message yet. This issue is currently blocking our team. Could you please provide an alternative way to share diagnostic information or escalate the issue internally? The previous model build continues to work, while the newly built version consistently fails.
Manas M 17,270 Reputation points Moderator

2026-06-15T09:31:13.86+00:00

Hey Martin Buroň

It seems you were not able to leverage private message feature

I have reached you over email shared previously

Thank you.
Martin Buroň 10 Reputation points

2026-06-16T07:19:49.4966667+00:00

Hi Manas,

Thank you for following up.

It appears that the issue has been resolved, and everything is working correctly again. We have not made any changes on our side, so we are not sure what was fixed or where the issue originated.

At the moment, the custom model is analyzing documents successfully and the previously reported error is no longer occurring.

Thank you for your assistance and support.
Manas M 17,270 Reputation points Moderator

2026-06-17T01:00:08.03+00:00

Sure, Martin Buroň

Thank you for the update.

Just quoting the disaster recovery guidance documentation to copy model to multiple regions to handle regional outage issues.

https://learn.microsoft.com/en-us/azure/ai-services/document-intelligence/how-to-guides/disaster-recovery?view=doc-intel-4.0.0

Thank you for the valuable collaboration provided during the investigation.