Can't activate subscription

I've purchased the Student Edition yesterday but when I want to activate my Language Cloud Subscription in Studio 2021 I get the following message:
The license key is not valid for this device. Try again with a different license or contact your cloud administrator.
https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0036866


The resolution in that link doesn't work. I've removed all USB devices, I've re-installed Studio, deleted my device from my live account and I still get that message.

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