Hello @Folkerts, Stephen [NN-US],
Welcome to Microsoft Q&A forum.
Please kindly check this document: Extend a trial version or update a license.
Visual Studio is licensed per user. You need valid product keys or a valid subscription if you switch to another account(admin account).
You can check here: Your Product Keys/Subscriptions for available/owned product keys and the subscriptions.
About signing in VS, (Help > Register Visual Studio) when you open VS, you can click "Sign in" button to sign in VS with a valid subscription or click "Unlock with a Product Key" option to enter a product key.
Best Regards,
Tianyu
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