I started seeing failures authenticating to FamilyControls on a test device and I think I've tracked it down to the underlying FamilyControlsAgent process crashing:
Terminating app due to uncaught exception 'CKException', reason: 'recordName (AAAAAAAAAAAAAAAADH0toCzCpPWEtIr89SNmamgacnXdKjEEhIjr/hu5Hm1Rdg85TfYRKG6o9DcxOOuAXBsJp+1+Fcd/8vYor2SXoOuRNN06PQNsv3sVy9ifrjzFU1l29ZrB68jM5P1Z9JhvvQhB57htPPSwKew8ZjYZKI2a6EUnc9f7TpevWkuvNPtJUUOY6H/Zmh66KXgCySiMv5c32kItb5/CB+hWPOb9u44NxGultUqMhzciWjNfitDXo28sxD4ktFf2Afd0+xO2GCkYlSyP8uxV/SHC/tc2o91EV2z+z9fq) is too long'
I can't imagine what I might have fed it from my to cause it to generate such a name, and 15.4 seems to be working just fine with the same code.
Any ideas?