one of my email accounts has stopped working

Yes. I have tried to put in the last 2 passwords I have had but no dice.  Should I change my my Xfinity password again and update on all email accounts to fix this?

That would definitely be the way to go at this time, @klll! The link to update your password is : xfinity.com/password Let us know if that gets the issue resolved.

The link you gave me is a 404 error code:

The page could not be found or you don't have permission to view it.

@kill  I apologize the previous link didn't work. Try this one and let me know if it worked or not https://www.xfinity.com/support/articles/changing-or-resetting-your-password.

OK--changed my main password and the password for both sub accounts in my Xfinity account.  Still not getting the email from my sub account--it says: "The entered credential or authentication information does not work or are no longer accepted by provider. Please change them."  Tried to change the pword there but it won't let me change the pword on the outgoing smtp so never gets properly updated.  

@user_6qmx9d​   So I think I've sorted my issue and mayhap this will help you.  Changed my main password and at the same time both of the sub accounts to same password on Xfinity.  Then went to Google passwords and changed all of them where saved.  Closed Google and my browser after signing out of xfinity and then reopened and signed on to xfinity with new password.  Opened email and everything updated straight away.  Then went on the change email passwords on my phone and all seems to be working ok now.  Hope that will do well for you:)

@klll thank you for sharing what steps worked for you with other customers to help get them back up and running.

@klll​ So what are you thinking, password for main and sub accounts need to be the same? That doesn't seem to make sense, but I guess with Xfinity, anything is possible...

Yes--I made all my emails the same pword for ease in opening all at once (as I use each email for different things).  One key appeared to be going into Google to change the pwords proactively instead of waiting to update when I went into the email programme.

Thank you so much for all your time on this! Let me see how we can dig a little deeper into this for you. Can you please send us a DM. Here's the detailed steps to direct message us: 
• Click "Sign In" if necessary 
• Click the "Direct Message" icon (upper right corner of this page) 
• Click the "New message" (pencil and paper) icon 
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list 
• Type your message in the text area near the bottom of the window 
• Press Enter to send your message