ACCESS_DENIED_CONTACT_SUPPORT in Notify

I'm trying to set up AWS notify for SMS-based MFA codes. I created a notify configuration to try to test everything with, but my config gets rejected with "ACCESS_DENIED_CONTACT_SUPPORT" as the rejection reason. I'm wondering if the automated review doesn't like the name of my app? That's the only free-text thing in the config; I can't imagine I got rejected for choosing "English" or template-004. I tried a couple different variations on the name. Always the same thing: ACCESS_DENIED_CONTACT_SUPPORT, so I opened a support case.

... This type of inquiry requires specialized review by our Billing and Accounts team, and I've forwarded your case to them to ensure you receive the most appropriate assistance. Please note that our Billing and Accounts team is currently experiencing high volume, which may result in longer response times than usual. ...

It's been a little over a month since I opened the case and it's still unassigned. I'm not in a rush particularly, but I'm kind-of starting to loose hope that anyone is going to pick up my ticket.