Hi there,
Thanks for writing in. If you you notice we have the following notice on the account page (that also exists on your screenshot) :
Looking for API keys? We’ve removed these in favor of just using the purchase code directly. For new site validations, you can use your purchase code directly. Sites previously validated with an API key, will remain validated, but moving forward API keys will no longer be used.
So let’s try validating with the purchase key directly.
Cheers!