The instructions say: Now your domain name should appear in the “New Subdomain” dropdown in the Gallery app.
I don’t see anything like this dropdown in the gallery app.
_84148c946a8e824e6a2d8661c2e137a0.metamushrooms.xyz. _1642adb71b2b12039e0457451688c705.xmjnffzjyj.acm-validations.aws. ISSUED
Also, I have never actually listed, just tried to make a draft in the Gallery App.