Blocked Xfinity Comcast IPMAP connections from outside the US

I'm unable to access the Xfinity Comcast IMAP servers from outside the US using various email clients, such as, Apple Mail on iOS, Outlook on Samsung Android and iOS, even though I can access the email via the Web browser email application on Xfinity.com. I'm trying to connect through a safe home Wifi connection, not a public internet connection. This started to happened heretically a couple of days ago (today is March 11, 2024), and now the failure to connect is continuous. I've tried resetting my email password, but to no avail. I've been travelling extensively outside the US for several months at the time, and this has never happened before, except for the past few months.