This is the second time when i have got this. The first time was in may, and error was "MISSING_BETA_COMPLIANCE ERROR" and now the error is "ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING" error. The result is the same. One cannot publish app to external testing, and private testing will be visible in test flight, but the install fails.
{
"errors" : [ {
"id" : "",
"status" : "422",
"code" : "ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING",
"title" : "Beta contract is missing for the app.",
"detail" : "Beta Contract is missing."
} ]
}