Hello Edge,
You could remove both devices and start fresh by re-logging in when your device that you are looking to activate is deactivated:
Remove a device from your Microsoft account
If this is helpful please accept answer.
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I have 2 copies of Office 2021 on my MS account that were installed on 2 separate PCs on the same day. I need to reinstall due to a Windows refresh but don't know which Office is which. Am I to assume there's no way of knowing which one is for my laptop and which one for the PC?
Hello Edge,
You could remove both devices and start fresh by re-logging in when your device that you are looking to activate is deactivated:
Remove a device from your Microsoft account
If this is helpful please accept answer.