I looked up that address, and it’s not known by our system.
The email you use in the forum did do a trial of Go that ended in May, but wasn’t used when you paid for it. Your iCloud email only has access to the free version, even though it was the email used to pay for the subscription.
At the moment I’m puzzled. It’s possible that buying a Go subscription entirely through Apple doesn’t show up in our system. I’m looking into whether there is a restore purchases option you could try.