Flex Consumption Function App is autorenewing App Keys

Question

Flex Consumption Function App is autorenewing App Keys

J 0

We recently migrated an existing Python Function App from a consumption plan to the new flex consumption plan. Storage location of the old app was reused for convenience and all custom app keys on host and function level were migrated.

Since the migration, all our app keys seem to get auto-renewed about every 48h, locking out all of our users until we manually reset the keys.

Out of this, there's now multiple questions:

Why do my app keys get auto-rotated?
How do I turn this off?
I now reconfigured my function app to use app keys stored in a KeyVault. Will this solve the auto-renewal issue?

Thanks and cheers,

J

Pravallika KV 14,640 Reputation points Microsoft External Staff Moderator

2026-02-02T09:40:09.33+00:00
Hi J,

Thanks for reaching out to Microsoft Q&A.

Check the below insights regarding your queries:

Why do my app keys get auto-rotated?

The auto-rotation of app keys can be influenced by various factors, including the runtime configuration or any policies set in your Azure environment. Typically, Azure Functions maintain a level of security by rotating keys periodically. This might be something tied specifically to settings within your Flex Consumption plan or stack configuration. It’s essential to check if there are any specific settings in your Azure portal related to key management.

How do I turn this off?

Unfortunately, there isn't a direct option to disable key rotation in Azure Functions. However, you can manage your keys more effectively. If you're facing issues with frequent key changes disrupting your operations, consider integrating with Azure Key Vault to store your keys securely. This way, even if the keys rotate, you can smoothly manage key retrieval in your application code.

I now reconfigured my function app to use app keys stored in a KeyVault. Will this solve the auto-renewal issue?

Switching to using Azure Key Vault for storing your app keys can indeed help with the management of those keys. If your app is designed to retrieve keys dynamically from the Key Vault, this can mitigate the immediate impact of key rotations since your app won’t rely on the static keys managed by Azure Functions. It looks like a solid plan to improve key management workflow.

Here's the actions you can take:

Investigate Key Animation Settings: Check the Azure documentation for any specific settings related to key management in your current Flex Consumption environment.

Explore Azure Key Vault: If you haven't already, integrate your function app with Azure Key Vault for key management to provide more flexibility and security.

Monitor Logs: Use Application Insights to monitor any relevant logs that indicate when and why key changes are occurring. This can also provide insights into any unexpected behavior.

Hope this helps!

References:

Securing Azure Functions - Function access keys

Using Azure Key Vault with Azure Functions

Work with access keys in Azure Functions

Create and manage function apps in the Flex Consumption plan
Pravallika KV 14,640 Reputation points Microsoft External Staff Moderator

2026-02-09T04:03:51.91+00:00

Hi J, following up to see if you had a chance to check the above response and if it was helpful. Please let me know if you have any questions.
J 0 Reputation points

2026-02-09T07:39:53.5266667+00:00

As I already answered you in your private message, your answer was unfortunately not helpful. It is the same AI-generated text that was proposed to me before I could post my question and it fails to address the problem and even contradicts itself.
Pravallika KV 14,640 Reputation points Microsoft External Staff Moderator

2026-02-09T07:42:10.1066667+00:00

Thanks for the confirmation, J. I will check and update my comment.

2 answers

Your answer

Pravallika KV 14,640 Reputation points Microsoft External Staff Moderator

2026-02-09T04:03:51.91+00:00

Hi J, following up to see if you had a chance to check the above response and if it was helpful. Please let me know if you have any questions.
J 0 Reputation points

2026-02-09T07:39:53.5266667+00:00

As I already answered you in your private message, your answer was unfortunately not helpful. It is the same AI-generated text that was proposed to me before I could post my question and it fails to address the problem and even contradicts itself.
Pravallika KV 14,640 Reputation points Microsoft External Staff Moderator

2026-02-09T07:42:10.1066667+00:00

Thanks for the confirmation, J. I will check and update my comment.

Answer 1

Sanjit Patel 0

I had a function app on a flex consumption plan with the same symptoms. However, in my situation, the storage container had a lifecycle mgmt rule to delete blobs older than 7 days. I added a filter to select the specific folders to delete

0 comments

Answer 2

Answering my own question now:

I still don't know...Probably a side-effect of reusing the storage account from my previous azure function and some lingering artifacts. I would recommend to either start on a clean storage account or check manually that all data relating to the function has been deleted from the storage account before creating a new function where there already has been one before.
Automated key rotation with keys stored on the function app storage account is not a feature that exists, so logically there's no option to turn it off.
Switching to the key vault did solve the problem. The keys have been stable since then.

Beware of the AI generated answers with their "have you tried resetting your computer" vibe. Half of the info up there is misleading ("Azure Functions maintain a level of security by rotating keys periodically"s...no they don't) or contradicting ("there isn't a direct option to disable key rotation in Azure Functions" vs. "Investigate Key Animation Settings: Check the Azure documentation for any specific settings related to key management in your current Flex Consumption environment.")

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Flex Consumption Function App is autorenewing App Keys

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