Henrik,
what is your authentication method? Microsoft only allows
AuthMechs XOAUTH2
since a few months. A startpage.com search for "mbsync office365" might
yield additional hints.
best, P
* Henrik Frisk <fris...@gmail.com> [2024-01-29 08:50]:
> Hi,
>
> Well aware this is not a question for the devel list I'm taking my chances.
> After no configuration change my mbsync command started returning this
> error (not every time, but farily often):
>
> IMAP command 'AUTHENTICATE PLAIN <authdata>' returned an error:
> AUTHENTICATE failed.
>
> Any ideas that might have caused this? The server is an Office365.
>
> Best,
> Henrik
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