Interesting, I haven't heard of any other apps having this issue. Did Exist offer a way to sign up new accounts in their app? If yes, that may be it. Slack do

Interesting, I haven't heard of any other apps having this issue. Did Exist offer a way to sign up new accounts in their app? If yes, that may be it. Slack doesn't have IAPs and yet, I can sign in with paid accounts just fine. There are other apps that were like this but they didn't have a way to sign up in-app IIRC.