Studio 2021 "license expired" error message with a perpetual license - can't deactivate or reset it.

I can't access Studio 2021 (perpetual license) on my work laptop, I'm getting the message "License expired" and if I click "Activate" I'm told it's already in use. (It's licensed for two computers, the one I'm trying to use it on and an old one that's no longer in use.) Reset license didn't work, and I can't deactivate and reactivate it. Any help gratefully received.

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