Can't Open Outlook on Web after changing Primary Username in Admin Center

Question

After changing primary username. I'm unable to use Outlook on Web. It will just keeps on asking account to sign-in, after choosing the new username account and login it will return to the same page asking what account to sign-in, stuck in loop unable to proceed to Outlook on Web. OneDrive,Teams,SPO working fine just the Outlook on Web stuck unable to use it. Tried In private, clear cache and cookies still unable to proceed to Outlook on Web.

leonpavesic · Answer

Hi&nbsp;Anos_Voldi,When you make changes to the primary username in the Admin Center, it's crucial to double-check that the new primary email address has been accurately updated. Any errors or typos in the email address can lead to difficulties in accessing Outlook on the web.Check the primary email address associated with the user's account. Verify that it matches the new username precisely, including any domain or email suffix (e.g., @yourcompany.com).Please click Mark as Best Response &amp; Like if my post helped you to solve your issue.This will help others to find the correct solution easily. It also closes the item.If the post was useful in other ways, please consider giving it Like.Kindest regards,Leon Pavesic

it_for_the_community · Answer

LeonPavesic&nbsp;Just for general consumption, I have had the same problem with a business account where I set up new User accounts and then completed the DNS and domain set up.&nbsp; All the information was verified and it let me log in and set up MFA.&nbsp; However, Iogging into&nbsp; Outlook presented the same problem as Anos_Voldi&nbsp;described.&nbsp; On contacting Microsoft support they confirmed that this is also caused by a known problem with the O365 platform.&nbsp; &nbsp;A diagnostics process needs to be run which apparently resolves the issue.&nbsp;

duanewaddle · Answer

IT_for_the_communitywhat "diagnostic process"?&nbsp; Is this something that MS Support must do, or is it self service?&nbsp; Any hints on how to proceed?

luckman212 · Answer

Yes IT_for_the_community can you please share a little more detail on what's needed? I suffered for 2 hours with this today before "giving up" and just removing the "Work or School" account linkage from Settings → Accounts. That allowed the user to at least sign in temporarily...

kdaycwcocom · Answer

luckman212&nbsp;The short answer is, as you have probably discovered, you need to wait up to 24 hours after making changes to email\accounts to have Outlook\outlook web work correctly.&nbsp;&nbsp;Long answer- I am currently preforming a tenant-to-tenant email migration at the moment.&nbsp; The domain is being migrated as well.&nbsp; The new\destination accounts are currently using email address removed for privacy reasons domain.&nbsp; When the domain that is being migrated is removed from the current tenant and added to our tenant the accounts will need to be changed to the migrated domain.&nbsp; I created a test account in my tenant.&nbsp; The tenant already has multiple domains.&nbsp; I logged in as the user in O365 and opened outlook, word, etc.&nbsp; I then changed the primary email to a different domain on the test account.&nbsp; This changed the primary email and the username.&nbsp; It also set the first domain as an email alias.&nbsp; I was immediately able to sign in using the new email\username.&nbsp; All apps opened fine except for Outlook.&nbsp; I had to click the username 10 times, then refresh the page and it finally opened.&nbsp; This occurred for 9 hours. After that whatever needed to sync, replicate, or whatever had done so.&nbsp; I saw similar articles online stating that it can take up to 24 hours for "Exchange" changes to replicate even in O365.&nbsp; Always test things before the actual changes.&nbsp; We know what the changes should do but are never certain of what they actually do unless we test first.

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Can't Open Outlook on Web after changing Primary Username in Admin Center

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