Problems syncing outlook.com

Problem

Roughly every day I get a red square telling me that outlook.com could not sync anymore and I have to reconnect. From memory this only started happening a few months ago as initially with MailSpring I don’t remember seeing this. Also, previously with Mac Mail and Thunderbird I never saw this issue.
Suddenly my email @outlook.com cannot synchronize anymore seems similar but not identical to my issue.

Context

No.

outlook.com

Setup

  • OS and Version: Sonoma 14.8.5
    • Installation Method: default
  • Mailspring Version: 1.26.0

Just happened again.

“Authentication Error - Check your username and password. (IMAP)”

Quite odd since nothing in user or pw changed.