ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING

I cant install app from testflight, i get the error Could not install APP. The requested app is not available or doesnt exist. and also i cant add external testers, i get the error

  "errors" : [ {
    "id" : "512439fe-9892-4dc1-a260-22ff0908e15d",
    "status" : "422",
    "code" : "ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING",
    "title" : "Beta contract is missing for the app.",
    "detail" : "Beta Contract is missing."
  } ]
}

Sample app with apple ID 6821153194