TestFlight - Error 422 (ENTITY_UNPROCESSABLE) When Distributing Build to External Testing Groups

Hi everyone,

I'm experiencing an issue in App Store Connect when trying to distribute a build to external testing groups in TestFlight.

Every time I attempt to distribute the build, I receive the following error:

{
  "errors": [
    {
      "id": "ea3018e2-3693-4522-8710-c1a7d8a18dc3",
      "status": "422",
      "code": "ENTITY_UNPROCESSABLE",
      "title": "There was an error processing your request.",
      "detail": "Please try again later."
    }
  ]
}

I've already completed all the required Beta App Information in App Store Connect, but the error still occurs when I try to distribute the build to external testing groups.

The error message doesn't provide any specific explanation of what's causing the issue.

Has anyone else experienced this recently? Is this a known issue with App Store Connect, or is there something else I need to configure before distributing builds to external testers?

Any suggestions or solutions would be greatly appreciated.

Thanks in advance!