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Yes, they changed some time ago, however they carried on working for a long time and then ceased to do so, and I didn't do anything about the annoying password requests because I didn't see immediately why I was being asked for them. It turned out to be the Lightning extension in Thunderbird which I haven't used in a long time (in fact, I mostly use the web interface which is why I'd let this slide).
I deleted the old calendars and followed the latest instructions, including trying restarting Thunderbird. Am parking this for now and will revisit later. My Lightning version is showing v6.2.5, not the same revision as Thunderbird, which I think it should now be, so I suspect it's a Lightning problem not a Fastmail one.
Am aware of the blog and of Fastmailstatus, thanks. (Been using Fastmail for a while)
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