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Hi all! I'm having an issue with Thunderbird in conjunction with my Outlook account.

I used to be able to add my account just fine (using OAuth2). But for a few months now, I have been getting "Authentication failed" errors (see first picture).

It used to be that I could temporarily remedy this by signing out and back in. Today, however, I was unable to sign back in, using the stock settings for Outlook (see second - fourth picture). No authentication popup appeared.

I was sporadically able to add the account and get messages to start appearing by clicking on "Edit configuration" and removing and re-adding the hostname for the IMAP server, without an authentication popup appearing. I therefore suspected that there might be some half-stale credentials stuck in the cache, and there probably were, because after clearing my cache this method doesn't work anymore. I am still not getting any authentication popup though.

All the usual suspects I already tried: Thunderbird is up-to-date (151.0.1), my Outlook account definitely has IMAP and SMTP activated, and another mail account (gmail) works without a hitch on the same system.

I hope that someone can help me, as I'm at my wit's end. Thanks in advance!

This is a Thunderbird question so be patient :). All of a sudden I was locked of MyMail and Mail on iPad and iPhone so I updated my comcast password but I can't update it in Thunderbird because it isn't accepting my old password. When I try to send a message there's a window that pops up that says why it wasn't sent and it says enter new password but when I click on that it goes away and doesn't let me enter one. When trying to figure this out I googled and it suggested removing all providers if I wanted to use all new credentials. So I have to add Comcast back in but I don't know how. So now it doesn't give me the option to show passwords. So i screwed up. How do I straighten this out? Plus it is now almost midnight and I have not received any new emails since this morning. I think part of this is the business about having to change to a new Comcast email system. But I still need help with the password issue. I have an appointment with Comcast tomorrow afternoon so hopefully I can start to get emails in MyMail. TIA.