Same issue here. Inspected the calls with Fiddler and saw the below. Opened a support ticket, gave them the requested info and waiting for response.
From what I've read on other threads/sites is that this just appears to happen to certain users/apps and it takes a week for something to happen and it gets fixed. Either by them doing something (and then not telling anyone what they did) or possibly by some backend integration. We must all be doing something similar to cause us to have this problem. This is my first attempted build through testflight, did anyone else get this error after previous builds worked fine?
{ "errors" : [ {
"id" : "<redacted>",
"status" : "422",
"code" : "ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING",
"title" : "Beta contract is missing for the app.",
"detail" : "Beta Contract is missing."
} ]
}