Hey there!
Sorry for the delay in response but I’m still trying to research that as you see we’re doing everything per what the docs say, everything is correct. I was researching whether that custom domain is not causing the problem. Sorry for the delay but I’m still working on that.
When it comes to immediate support as you are a paying customer to get premium support you should have opened a support ticket. This way the issue should be resolved in a quicker way. We have a lot of questions coming here in the forum primarily from free customers as they have no other way to file support questions so sometimes the response time for anyone even paid tier can get longer. Sorry for that!