I am unable to connect my Xfinity email with Outlook on my Macbook Air

I love my Xfinity email but I am have been having a problem for a week now with my new MacBook Air that I can't solve.  Please help me.

DESCRIPTION OF ISSUE: I want to connect my Xfinity email with Outlook on my Macbook Air, but so far, I have been unable to do so.  When I go through the process as specified by Xfinity and Outlook, I am unsuccessful and receive the following error message: "We encountered an error while adding account. Please try again."

WHAT I ALREADY TRIED:

• Yes, I have checked and double checked all of settings including incoming server port 995 and outgoing server port 587).  All are confirmed.  Please don't suggest this.
• Yes, I have checked and double-checked my user name and password. Both are confirmed.  Please don't suggest this.
• Yes, I have ensured that I have turned ON "access to third-party email programs" in Xfinity Email. This is confirmed.  Please don't suggest this.

I think there must be another security setting that I am missing that has been established because "these programs could expose your Xfinity ID and password to fraud and other risks."  I suspect that there is not public answer in these discussion boards for security reasons (I have gone through EVERY related topic).

Please - I need help and if you can't provide a public answer, please send answer to [Edited: "Personal Information"].  Thank you very much!