iphone
unable to receive or send email on iphone. Message is cannot get mail user name or password for "Comcast" is incorrect
iPhone XS Max, iOS 15
Is this a recent problem, or has it never worked? If it is recent, and you have not charged you password, it may be a Comcast outage.
If it has never worked go to Settings/Mail/Accounts, tap on the Comcast account and delete it. Then restart your phone and add it back.