Hello,
I have a problem with Outlook 365 configured with an Exchange Online mailbox in Windows 10, after working perfectly for several months, suddenly at random times, when Outlook is started, it will not connect (“Trying to connect” appears in Outlook status bar). In the event log the following event appears:
“The Exchange web service request GetAppManifest failed. The error code is 0. HTTP response code: 401
Additional Error Message: An unknown internal error occurred. The error code is 80004005”
The mailbox can be opened perfectly fine in a web browser (OWA) in the same computer, and Outlook 365 with the same account works fine in another (work) computer and on the user's phone.
I've verified the internet connection for the computer and it is working fine, there isn’t any firewall or antivirus installed other than Windows Defender (it’s a home computer). I tried to uninstall and reinstall Office 365 and recreate the profile but the issue persists.
Any ideas of what can be causing the problem?
Thanks,
Ricardo
