2021 Subscription

Hi

I've purchased a Studio 2021 subscription and when I try to activate this I receive two error messages:

1

Object reference not set to an instance of an object

2

The license key is not valid for this device. Try again with a different license or contact your cloud accounft administrator.

The configuration of the computer has not changed since purchase, download or installation. Would be grateful for any help.

Regards

Tim