Hi, all,
I have this problem off an on. It's frustrating.
Today, my office computer started non-stop asking for my pw and would not receive or send email. When I tried to fix it, the pw message stopped, and I was still not getting emails from my twc account, one of three email accounts on my office computer, home computer, and samsung phone (gmail and my own work domain).
I could get the emails on the twc email website, on my phone (samsung s21 ultra 5g), and my home computer.
I tried some of the recommended solutions which did not work. Checked my pw, which was the same as all my other devices.
Finally, I discovered that my server settings were incorrect. they got changed somehow, and not by me. Maybe a windows update or an Outlook anomaly.
I changed the server settings, and despite another error message, the email account on my office computer (Windows 11, Office 365) started working again.
I hope this might help someone else before they create a new profile or remove and re-add the account. It's something to check early in the troubleshooting process.