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Connecting to outlook.office365.com fails after upgrade to 102.9.1

  • 5 replies
  • 1 has this problem
  • 9 views
  • Last reply by christ1

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Hi, I upgraded from 102.6.1 to 102.9.1 on windows 11 and now my imap connection fails to outlook.office365.com. It asks for a username/password and uses the authentication method OAuth2 as before. Still, after authentication, through the authenticator, I am getting this message that authentication failed because the application is not allowed by administrator. But nothing changed at the backend! So I installed 102.6.1 again and all is fine. Any ideas?

Hi, I upgraded from 102.6.1 to 102.9.1 on windows 11 and now my imap connection fails to outlook.office365.com. It asks for a username/password and uses the authentication method OAuth2 as before. Still, after authentication, through the authenticator, I am getting this message that authentication failed because the application is not allowed by administrator. But nothing changed at the backend! So I installed 102.6.1 again and all is fine. Any ideas?

All Replies (5)

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Hi Crhist1, Thx, but this blog mentioned it is fixed in 102.7.1. But I tried 102.9.1 and in this release, it isn't working.

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The change has been introduced in Thunderbird 102.7.0. "If you encounter a screen saying “Need admin approval” during the login process, please contact your IT administrators to approve the client ID 9e5f94bc-e8a4-4e73-b8be-63364c29d753 for Mozilla Thunderbird (it previously appeared to non-admins as “Mzla Technologies Corporation”)."

There is no way around that.

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What a big disappointment. This forces me to start using outlook client. I have 2 corporate email accounts and the ICT departments are not going to make these individual adjustments, just for me and thunderbird!

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I have 2 corporate email accounts and the ICT departments are not going to make these individual adjustments, just for me and thunderbird!

You're not the only one with this problem.