I'm encountering the exact same issue. No error in the UI, error 500 with a json object :
{
"validationResults": [
{
"field": null,
"localizedField": null,
"validationRuleName": null,
"messageKey": null,
"error": null,
"propertyName": null,
"errorShortMessage": null,
"errorFlag": null,
"errorString": "An unknown error has occurred.",
"errorNumber": -21607
}
],
"status": null,
"code": null
}
https://appstoreconnect.apple.com/sandbox/v2/account/create
zebishop
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
In my case, that was an email that was from a domain Apple did not like. When I switched to a more "common" account (something gmail related) it accepted my users.