I am using Office365 as SMTP Sender.
The connection worked without any problems after setup. After half an hour the following error message appears. If I then save the SMTP data again and confirm the OAuth connection with Office365, it works again for about 30 minutes. Then the error message comes again.
IMAPOAuth2: Could not request access token for xyz@domain.com/outlook.office365.com'. The refresh token could be expired or invalid.
IMAPOAuth2, The refresh token could be expired or invalid
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