apple tv+ won't play movies on safari

Apple TV+ no longer plays movies on Safari. I can log into my account but when I click on a movie to watch it loads but then just stops after about 10 seconds. Nothing plays. I checked the preferences and can't find anything that might be blocking it but see nothing. Apple TV+ works fine on Firefox, so the problem is with Safari. Anyone have any suggestions, apart from not using Safari? This is a new problem, perhaps since upgrading Safari.

OS 12.7.2

Safari 17.2.1