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

ChrisEaker 90

I have multiple employees that access their personal email and several group mailbox account using office 365 and Edge. They choose to open the group mailboxes in their own window vs. working on behalf of the group mailboxes. I have one user (out of dozens) that is receiving the following message each time she opens her mailbox after switching from one of the group mailboxes.

User's image

She then is prompted to log into the Information deleted for privacy protection

. We have to say log in with a different account and then choose her account

We have run windows updates, edge is up to date and have cleared all her brower cache. It reproduces the issue when the computer goes to sleep as well

PaulHogan-8231 0 Reputation points

2025-10-15T20:47:19.6933333+00:00

Sorry to add more detail of the questions asked above... this is happening when trying multiple browsers and we are using the "Open another mailbox" option in the top right when you click on your user profile.
O-Elf 0 Reputation points

2025-10-15T20:55:18.17+00:00

Likewise experiencing the same thing. I never had this issue until just 30min ago, Both "Open another mailbox" and the "dd the group mailbox to Outlook web:" do not resolve this.

This is extremely problematic for anyone working an office job (i.e 95% of MS users) who need to have literally more than one inbox open at a time. This wasn't an issue before so not sure why it's an issue now
PaulHogan-8231 0 Reputation points

2025-10-15T23:29:39.6666667+00:00

This could be fixed now... seems to have cleared up for one of my users... will need to test more tomorrow... let me know if its the same on your users end...
Katherine Johnston 5 Reputation points

2025-10-16T05:35:29.9866667+00:00
I have experienced this same issue just in the last day. I have a standard mailbox and two shared mailboxes that I always open in separate tabs. One of them was still opening fine, but when I opened the second one and tried to go back to the other one I would get the Account Switched error.

I followed the steps below to add the shared mailbox but it was already there, so I removed the second shared mailbox and re-added it.

Now I don't get the error if I open the second shared mailbox first. If I open the First one then the second one I still get the account switched error.

I tried removing and re-adding the first shared mailbox but the error still persists if that is the first one opened. If it is the second one opened first the error does not occur.

The mind boggles.

++++++++++++++++++++++++++++++

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. ++++++++++++++++++++++++++++++
Lauren 0 Reputation points

2025-10-16T08:42:17.79+00:00

I'm having the same issue as of today (UK) - using edge and 'open another mailbox' from my main account; all is well for a couple minutes moving between them until Microsoft decides that, actually, it doesn't like that and notifies that an account switch has taken place. Have tried all the usual steps with no change, it's infuriating.

Perhaps coincidentally at the same time the tab icons have today started flipping at random between the new version and the old...
Sara Abbonizio 0 Reputation points

2025-10-16T09:39:28.1866667+00:00

We are also experiencing the same exact issue, on both Chrome and Edge browsers. It started happening at random yesterday.

It's been happening on different PCs with both Windows 10 or 11 installed.
ChrisEaker 90 Reputation points

2025-10-16T13:33:23.36+00:00

We use Edge and are selecting open another mailbox under user profile
ChrisEaker 90 Reputation points

2025-10-16T13:44:17.2866667+00:00

I was seeing the EXACT same thing. I am waiting to hear back from my user to see if this has mysteriously fixed itself.
ChrisEaker 90 Reputation points

2025-10-16T14:04:56.4+00:00

Has this cleared up for your users today?
Craig Nielsen 0 Reputation points

2025-10-16T17:04:30.6233333+00:00

Having the same problem, reports started yesterday morning from our users. Seems to be account related not browser related. Does it in edge, Chrome and Firefox
Brendan Lazaro 0 Reputation points

2025-10-16T22:37:05.91+00:00

My client started experiencing this exact behaviour Oct 15, 2025. InPrivate nor resetting Edge did not help. This is not yet disclosed in 'Service Health' yet.
Don Arsenault 0 Reputation points

2025-10-17T01:51:06.3633333+00:00

This issue is happening to me too, starting yesterday 10/15/2025. For years, I've had my mailbox open in one tab and a shared mailbox in another tab. Now the "Account Switched" message pops up in the shared mailbox tab. Happen when I refresh my mailbox tab, and restarting the browser; but I'm sure it happens other times, too.

I also added the shared mailbox to be below my mailbox. But that view has some negative side effects. Deleting a message sends it to my mailbox Deleted Items instead of the shared mailbox. And it uses settings for my mailbox rather than the shared mailbox, like automatically marking a message as read (I want the message to stay unread until someone on the team is working on it).
Aftab Ahmad 0 Reputation points

2025-10-17T10:11:19.2333333+00:00

I discovered this issue today, it's happening for users in Chrome too, opening another mailbox prompts with a message asking to switch to that shared mailbox as a user context. Going back to the personal mailbox asks to log in again, but we have to choose sign in with another user to be able to get back to the personal mailbox.

Not great when I was in the middle of showing someone how to use Outlook and open other mailboxes to be able to do their job and are now faced with this problem.
ChrisEaker 90 Reputation points

2025-10-17T12:29:19.9166667+00:00

I have submitted a ticket to Microsoft support. Don't know if I will get any help for us but i will try
Aftab Ahmad 0 Reputation points

2025-10-17T12:39:09.9033333+00:00

Thank you.
Chris Coffey 0 Reputation points

2025-10-17T14:52:54.3733333+00:00

Also have many users affected. Following for updates.

7 answers

CJ 0 Reputation points

2026-04-14T22:27:39.1966667+00:00

I never heard of this before, BUT, a friend just used my computer to make a new outlook account and I was right within ear shot. I was signed out and had even cleared history, cookies and such before my friend got onto my computer to do this.

I am using firefox. Anyway, she created her account while I was minding my own business and she asked what just happened. I asked what do you mean? She said it's saying something about switching to someone else's account after I made this one.

I went over to look and about panicked. It was switching her to MY SIGNED OUT ACCOUNT!!!

And this is 4/13/2026 and I see you guys are complaining from 2025 so I would say NOTHING has been fixed. But it better get fixed, this could ahve been a serious privacy issue for me, as well as those talking about personal accounts on a company computer!!!
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Lia V 6,265 Reputation points Microsoft External Staff Moderator

2025-10-17T22:45:45.6033333+00:00

Hi @ChrisEaker,

Thank you for taking the initiative to submit a ticket to Microsoft Support. Your quick action gives this problem a clear path into the right hands, and I appreciate it.

I am hopeful that your case will move through triage quickly and get the right attention. The sooner Microsoft analyzes it; the sooner we can restore a smooth experience for everyone.

In the meantime, I’ll be actively monitoring for any updates or developments and will share them in this thread as soon as they come through. If you hear back from Microsoft Support or receive any progress on your ticket, please keep us in the loop. It ensures that we stay coordinated and can respond swiftly to any changes.

I have also found a similar entry in the Microsoft Feedback Hub from another user. At your convenience, please accept and upvote this response so others encountering the same issue can quickly locate the feedback link, without having to scroll through multiple responses, and add their input.

I’ve already contributed my vote to help draw attention from the product team, and your support can make a difference too. Everyone who participated in this Q&A thread is encouraged to contribute their votes and share their experiences. Together, we can ensure this reaches the Microsoft product team promptly.

Switching Between Accounts · Community

Thank you again for stepping in and moving this forward. Your effort is helping your users and everyone affected get back to a smoother workflow as soon as possible.
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Lia V 6,265 Reputation points Microsoft External Staff Moderator

2025-10-20T16:44:20.43+00:00

Hi @ChrisEaker,

I hope this message finds you well. I wanted to follow up to inquire whether there have been any developments on your end. Should you have any updates or require further assistance, please do not hesitate to reach out.

ChrisEaker 90 Reputation points

2025-10-22T19:42:59.0166667+00:00

This went away as mysteriously as it started. I have told Microsoft to consider the matter closed.

Don Arsenault 0 Reputation points

2025-10-22T19:51:38.3066667+00:00

Odd. It's still happening to me. I just refresh a tab; the other tab pops up the "Account switched" message and switches the tab to the other account. Maybe the fix is slowly rolling out...

Lia V 6,265 Reputation points Microsoft External Staff Moderator

2025-10-23T22:09:35.2266667+00:00

Hi @ChrisEaker,

Thank you for the update.

I’m glad to hear the issue has resolved and is no longer causing any inconvenience. If you need anything else or run into any other concerns, please feel free to reach out anytime.

Don Arsenault 0 Reputation points

2025-10-24T02:31:05.11+00:00

My situation has improved now. The "Account switched" message no longer appears when I refresh the other tab. But the message appeared after restarting my computer.

Thanks to those who contacted Microsoft!
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User receiving Account Switched in outlook 365 when switching between windows in Edge

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