Testing Age Assurance

I've been trying to follow Apple's testing age assurance documentation here.

After following each step and setting my user as "Texas, child 16-17, significant change declined", the AgeRangeService consistently throws the notAvailable error:

do {
  let response = try await AgeRangeService
  .shared.requestAgeRange(ageGates: 18, in: self)
  // ...
} catch AgeRangeService.Error.notAvailable {
  // Always throws this error
}