You are trying to connect your Salesforce org to Anypoint Platform. You are receiving the error: "Organization is not yet onboarded to GDoT." Request backend provisioning or onboarding for your Salesforce org to GDoT.

Echoing what is already said above, this is an onboarding thing on the Salesforce side and not something wrong with your setup. If it has been more than a day, raising a case is the fastest way to get unblocked.