Outlook prompting for IMAP password

I'm seeing exactly the same symptoms - for about a week now, upon opening Outlook, and randomly thereafter, I am being prompted for my email account password. Outlook client on Microsoft 365. Same email client configuration has been in place for years without issue, across multiple laptops and PCs. Interestingly I do not see the same issue in the Outlook app on my Google Pixel phone. I had suspected it to be a server-based issue, which this thread seems to confirm. So waiting for Microsoft to fix it.