Inbound and outbound mail using 3rd party applications stops working when traveling

For months I have been experiencing issues receiving and sending emails via 3rd party mail applications such as Mac native Mail or Outlook, especially when traveling (both domestically and internationally). Once I return to my home state, the issue miraculously resolve.

Focusing on the outbound mail issue first, I have confirmed that the correct box is checked to allow access to 3rd party mail applications but continue to experience issues sending mail. I have confirmed the correct credentials are configured in the settings area of both my iPhone, Mac native Mail and Outlook applications. At this moment, I can receive mail but cannot send mail from 3rd party applications but sending mail is working successfully via the web interface.

Inbound mail issues seem to precede my outbound mail issues. When traveling, I suddenly begin getting prompts to enter my password when attempting to fetch inbound mail on the Mac native Mail and iPhone Mail applications. Whether I enter a password or not, the mail continues to be retrieved and shown to me. Obviously it's not a password issue despite the pop-up panel to enter login credentials. This is completely annoying behavior.

What is going on Xfinity? This level of service is unacceptable. Trying to get assistance via your bot is infuriating as well. I am hoping to get some answers here in this forum.

Thanks in advance to anyone that can direct me to a solution.