User receiving Account Switched in outlook 365 when switching between windows in Edge

Hi @ChrisEaker,

Welcome to Microsoft Q&A forum. 

Thank you for reaching out and providing details about the issue where the “Account switched” message appears when switching between mailboxes in Outlook 365 using Microsoft Edge.

This behavior typically occurs because Outlook on the web uses a shared authentication session within the same browser profile. When multiple Office 365 accounts are opened in separate windows under the same Edge profile, the authentication token can switch between accounts. This results in the prompt you are seeing.

To better assess and address the issue you're experiencing, could you kindly provide the following details:

• Is the user accessing the group mailbox by signing in directly, or is it added as a shared mailbox in Outlook?
• Does the issue persist when using InPrivate mode or a different browser (Firefox or Chrome)?
• Has the user tried using separate Edge profiles for each account?

In the meantime, here are some workarounds you can try to help resolve the issue:

1/ Use different browsers for each account:

• Sign in to your primary mailbox in Microsoft Edge.
• Open the group mailbox in a different browser (e.g., Chrome or Firefox).

2/  Add the group mailbox to Outlook web:

• Open Outlook on the web and sign in with the user's account
• Click the setting icon next to the profile > select Account > Shared with me > Click the button "Add" and add the group mailbox.

Note: Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

I hope this helps resolve the issue with switching between accounts for your user. I'm glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.

If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.   

Thank you for your kindness and contributions to the forum.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Hi @ChrisEaker,

Thank you for bringing this to our attention. I completely understand how disruptive this issue can be, and I truly wish I had the authority and access to resolve it directly for you. Unfortunately, as a Q&A moderator, my capabilities are limited, but I want to make sure you have the best possible path forward.

This appears to be a back-end related issue, and other users have reported similar problems recently. To move forward, please consider the following steps:

1/ Contact Microsoft Support:

Please reach out to your IT administrator to submit a support request to Microsoft for deeper backend review. A technical support engineer can initiate a remote session to examine the situation, validate backend settings, and run any necessary synchronization tools to resolve the issue. If further analysis is needed, they can raise the case to a specialized team for deeper investigation. 

Note: If you are an end user, please contact your IT administrator to initiate a support ticket.

For detailed instructions on how to get support, please share this link to your IT admin: Get support - Microsoft 365 admin.   

Please note that forum moderators do not have access to user account settings and cannot assist with logging in, resetting passwords, or changing access rights. While we do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues, we’ll continue doing our best to support you within the scope of our responsibilities.   

2/ Ask your IT Administrator to report in Admin Center:

Please ask your IT administrator to review the Microsoft 365 Admin Center under Service Health for any relevant advisories. If no related information is available, kindly submit a report through the Admin Center so Microsoft can investigate the issue further.

Here are the steps for your IT admin to submit the report: Sign in to https://admin.microsoft.com/ > click Service health > select Issue history > Report an issue

3/ Share feedback through the Feedback Hub:

Our engineering team is actively monitoring this issue and regularly reviews customer feedback. The more votes and comments that a reported problem receives, the more attention it will get from the team. In fact, many fixes and improvements are prioritized based directly on customer input.

To submit your suggestion to Microsoft:

Go to: Microsoft 365 Feedback Hub →Send Feedback→ Describe your proposal in detail

Also, I encourage you to click “Accept Answer” on this post. After that, please post your Feedback Hub link in the comment of the "accepted" thread. By being "accepted", this response will remain pinned at the top, making it easier for others with the same issue to see it and vote. This helps ensure Microsoft notices and addresses the problem more quickly.

I’m truly sorry for the inconvenience this has caused and appreciate your patience and cooperation.

Our users in the UK also having this same issue today - occurs when using web access to open another mailbox. Work around for us has been to use full outlook temporarily and favourite the inboxes of each shared mailbox. However, users much prefer using separate tabs in the browser in their workflow.

I am in the UK and have had a user who accesses a Shared Mailbox and is now getting this error. This is a Microsoft issue which needs to be resolved. I have about 30 users in our High School who have access to Shared Mailboxes and this could escalate.

Alternative option

If you have access to just using the Outlook app, any Shared Mailbox should be listed below your primary inbox. Just scroll down on your left hand side pane and look for the Shared mailbox below. 😎 Issue is not happening inside the Outlook app.

I have having the same issue but for me it is on Chrome Browser. When I used the Edge to open shared mailbox everything woks ok but when I use Chrome Browser (even Incognito mode), I will get the account switched notification

hope this gets resolved