HBO Max App giving Title Not Available message on one Xfinity device

When trying to watch any movie or TV show on the HBO Max app on one TV through my Xfinity box, I receive the message Title Not Available.

It works on my mobile device and on other TVs with an Xfinity box.

I have signed out of the HBO Max App.

Cleared Cookies and Storage on my Xfinity box.

Signed back in, tried to watch a movie and got same error.

I've also turned off the Xfinity box, waited a few minutes and turned it back on.

I've restarted the single TV box.

It's worked on this TV in the past.

Any suggestions on what else to try?