Comcast imap email Failure

Good afternoon @grt182. When you have a moment, check out these links to see if they help. https://www.xfinity.com/support/articles/change-secondary-password 
https://www.xfinity.com/support/articles/account-email-information

@grt182 

I created an additional comcast email address associated with my Primary account (e.g., username@comcast.net and Password). This second userid and password have been set up in Microsoft Outlook (using IMAP) and has been working fine for many years. This passed week, Outlook fails to retrieve the incoming mail and pops up the message about having the correct userid and password. I’m assuming that the password is somehow messed up at the Comcast Mail Server end unless the entire email account was somehow deleted. When I log into my Primary Comcast account and go to my email I only see my original email address and it’s associated email messages. I can not find any information that the additional email address username@comcast.net even exists. Here are my questions:

How do I locate all of the email addresses that have been created for this primary account?

How do I change the password of the second email account username@comcast.net (I can only change the password for the email address associated with the Primary)?

You say you are logging into your Primary email address and see the messages associated with that address. 

• Have you signed out of Primary and into the Secondary email address? 
• Are you getting an error message when you try to do that? 
• When was the last time you logged into the Secondary email address on the website besides in Outlook and besides recently?