Email login error message and secondary email problems with password updating

For the last few weeks, we have been getting a pop-up error message on our email account: "Error--The provided login data to access mail server imap.comcast.net seem to be wrong. Please correct them." (For context, we set up secondary linked Comcast email accounts several years ago and have them all appear in the general inbox. We have never had any issues previously.) I called Xfinity on April 24, 2025 when this had been going on a few days and was told that it was a global issue and should be resolved within 24 to 48 hours. Clearly that has not happened. I looked at the individual email accounts under settings--the incoming server ports (IMAP) are 993 and the outgoing are 465. I'm assuming it's the passwords that need to be updated to match the new Xfinity password I created awhile back to increase security. When I go into those individual secondary accounts to update the passwords, I am able to change the incoming server passwords but not the outgoing passwords--that field is greyed out and cannot be changed. Trying to change just the incoming passwords produces the warning message "Validation of server imap.comcast.net failed due to invalid credentials" and gives me a choice between "cancel" and "ignore warnings," so I cancelled, not wanting to [Edited: "Language"] anything up. We are still receiving all the email from all the accounts--there has been no interruption (yet). Sorry for the long post, but I wanted to be clear on the problem and what I've already attempted. I would appreciate any advice on how to fix this issue. Thank you.