As an update, no good news yet, but Apple TV support has been exemplary, and I've been impressed with how well each new person I speak to quickly picks things up and moves my case along.
Key points
- In addition to "The Studio", the issue has spread to "Your Friends and Neighbors", "Foundation", and "Severance" – when I click play on these, nothing happens
- I can watch "Dope Thief", "Slow Horses", "Ted Lasso" and all the movies that I've tried, including ones I've watched and haven't watched
- I had thought it might be to do with new episodes of new programs, but "Foundation" throws that idea out – I thought I'd rewatch it, so I watched s01e01 again and then couldn't progress further
- With Apple TV Support, I have:
- Turned it off and on (natch)
- Cleared Apple TV library caches
- Confirmed no issues playing these shows on iPhone and the web interface
- Created a test user profile on my computer to see if the issue replicates for that user (and it does)
- Reinstalled the Sequoia operating system – it seems this is the only way to delete and reinstall the Apple TV application, and there's no ability to download the Apple TV app for Mac from somewhere to replace it (?!)
- Tested my account on another MacBook Apple TV interface (and it works)
Next steps
I now need to check how someone else's Apple TV account works on my MacBook to see if the issue replicates for their account. I suspect the same issue will happen, which will mean the issue is local to my MacBook only. At this point, Apple TV Support will allocate my case to an engineering team to work out what's wrong.
What I think is wrong
I suspect I've deleted some of the wrong library files at some point in the last two weeks. I've been having trouble with One Drive sync issues and been trying to fix that — when I open a Word doc from within Word using 'open recent files', I sometimes get a duplicate or read only error, which means there's an issue with where Word autosaves files when I'm working on them. I haven't worked that one out yet, but I suspect that in trying to fix that, I may have deleted something I shouldn't have.
Then again, other people seem to be having this issue, so it may be completely unrelated.
When I work it out, I'll post an update.