Same issue here. I purchased Adobe LR on my Mac on 24th Oct. Now it's been only 10 days, It's saying " The subsription has already been purchased from the Mac App store with a different Adobe ID". I can't use it anymore. I'd be looking forward for a help.
I moved your post over to the forum for the Lightroom desktop app, to help you get help quickly.
For the fastest help, please reach out to Adobe Support directly. Visit https://helpx.adobe.com/contact.html, sign in, and then click the chat button at the bottom right.
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