I can't activate my license on my new computer

I can't activate my license on my new computer.

I don't dare to deactivate the Studio 2021 on my old computer as I'm not sure I can re-install it.

I tried to re-install it on the new device but the app did not accept the activation code I copy-pasted from my rds account.

I use Trados Studio SR2 16.2.10.9305

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