Discord not working on iPhone

You will not get a follow-up here. This is a user to user support forum and Apple does not participate here. You need to contact Apple using the information in your email from Apple about your support ticket. Use the Get Support link at the top of the page here.

Unfortunately, there isn't much else that can be done. Did you tell Discord that you are seeing that error? I don't see much posted here about that app, but I am not aware of anyone that I know that uses it either. You will have to work it out with Discord. If they say it is Apple, they need to work with Apple about the problem that their app is not working on iOS.