I updated my iOS devices to iOS 15.1 recently and ... now Marvin 3 won't sync reading positions on any of the devices. I don't think I'd tried this since I was on iOS 14. When I request a sync what get back is:
Oops An error occured fetching sync locations from iCloud: Request failed with http status code 503
The 503 suggests that I should be able to try this again later but it's been the same for a few days now.
Is this one of those Marvin iOS update issues that I've been dreading? I do see that Marvin has storage allocated in my iCloud account. It doesn't seem to be able to reach it. Is this working for others?