Cannot Sign In to Some Office 365 Portals/Tools

SamG-5656 21 Reputation points
2023-03-10T17:44:54.3866667+00:00

2023-03-10 11_39_25-adf - Paint

I can no longer sign into certain online Office 365 portals. We are in the process of migrating from Exchange on prem to Office 365 and when I try to start a new migration batch, it says "We couldn't sign you in. Please try again.". But it works to sign into admin.microsoft.com, security.microsoft.com, Outlook, etc. Another portal I can’t sign in to is Teams online, the desktop and mobile application work just fine, only the web app doesn’t let me sign in. We are not blocking third-party cookies either. The address bar flashes a login.microsoft.com url on and off during the sign in process.

Things I've Tried

  • Added all office/Microsoft URLs to trusted sites and firewall whitelists
  • disabled MFA
  • tried on different networks/hotspots
  • different computers
  • off our domain
  • on personal computer
  • on mobile devices
  • different versions of Windows
  • different browsers (Edge, Chrome, and Firefox)
  • private browsers
  • removed Office licensing and added it back
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Accepted answer
  1. Aholic Liang-MSFT 13,826 Reputation points Microsoft Vendor
    2023-03-13T10:09:38.08+00:00

    Hi @SamG-5656 ,

    Just wondering if the account you're using is a global admin? We recommend that you appropriately revoke most permissions except for global admin and Teams admin to see if you can successfully sign in.

    In addition, there is a similar thread here, where some users say that logging in by modifying the time zone is successful:

    Teams-Login-Error :We couldn't sign you in. Please try again. - Microsoft Q&A

    Hope this helps!

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread

    1 person found this answer helpful.

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