I want to use Login with Amazon for Amazon.co.uk. So first, I tried to register with Selling on Amazon for Amazon.co.uk because it's required to use Login with Amazon in which case of Amazon.co.uk. But the message is shown below when I logged in after registered.
Status for your currently selected merchant and marketplace
Welcome to Seller Central
You don't have access to Seller Central yet.
When: Mar 18, 2017 2:28:25 AM
So I tried to ask my question to Amazon Seller Discussion Forum for Europe, but it failed because I can't log in with Seller Account for Europe. In the same way, I tried to use Contact Us page and it failed.
I'm stuck with what to do about this. Please tell me any solutions.