M365: "User authenticated but not connected"

Technical assistance
2

Solved:

  1. IMAP is not enabled by default in our tenant

AND

  1. Add “proxy_set_header X-Forwarded-Ssl; on” to “location /” section of /etc/nginx/conf.d/zammad.conf similar to Error 422: The change you wanted was rejected. [Office 365] - #6 by FunkStar
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