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Done that a long time ago. I can log into and see my email, but I am now receiving a horrendous amount of spam and phishing emails.  A secondary account shows a triangle and an error message, but I can't access it, although the account  user, my wife, has no issues on her PC or iPhone. 

GabrialS posted this two years ago, it seems to be a potential solution, but it didn't work as described.

"If you received this error when logged into webmail it is most likely due to setting up a secondary Comcast.net account within webmail. If you change the password to that secondary account, you must update the password in the settings of your primary.  To update the password, log in to webmail as you normally would and dismiss the error.  Go to the settings iconin the upper right-hand corner >> Click Email Settings  >> Accounts >> click edit next to your secondary email address and update the password.  Please note this is not changing the password for that secondary account, it should only be used to update to a recently changed password.   ??????

The screen won't update as described.  If we changed the password to the secondary account, which we did after Comcast was hacked last year, what does it mean to update the secondary in the primary?   If someone can clarify that would be helpful.

TIA