Comcast email does not work on iphone

Quote from Comcast: In general, Comcast email does not work on Iphone because of "incorrect MAIL app settings ." My email worked fine for years on iPhone until August this year & message popped up on phone "Comcast is not available". Purchased new iPhone 12, same thing happened. IMAP comcast.net Host; Port 993. for incoming and smtp.comcast.net with port 587 for outgoing. Local xfinity store associate said he couldn't help set up my email when I recently purchased new phone . Any suggestions. Can't figure out how to find my port settings.