All users are likely to experience issues with Xfinity Comcast Net Email Sign In when utilising the service. As a result, the problems are not inherent, although they may nevertheless lead to system or Comcast faults or improper user log-in attempts. You can contact Comcast support to get the best solution if you experience any additional issues with Comcast email login.
Source: https://www.emailsfix.com/comcast-email/comcast-email-login-issue/