we runing into same issue, contact Apple Support at Sep. 21, no any response yet.

Issue Submitting Builds for Beta Review - "Beta Contract is Missing" We are currently facing an issue when trying to submit new builds for review for external Beta testing. Each time we attempt to submit a build in the "What to Test" dialog, we receive the following error message: "There was an error processing your request. Please try again later." Upon inspecting the browser response when clicking "Submit for Review" in the "What to Test" dialog, we found the following details: code: "ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING" detail: "Beta Contract is missing." id: "4ed15cb2-2732-4100-a660-0899dcb0e25a" status: "422" title: "Beta contract is missing for the app." However, after checking the Developer Console, we are unable to locate any missing information or steps that need to be addressed. We would greatly appreciate your assistance in resolving this issue as soon as possible, as we are currently unable to push any new builds for testing.