Match the symptom with the exact viewing route
The official help has a specific entry for AirPlay cutting off when the iPhone or iPad screen closes. Establish that playback is being sent from the mobile device using AirPlay. A problem launching a standalone television application is a different observation and should not be diagnosed from the phone-lock instruction.
Check the documented mobile improvement
MĀORI+ says version 6.1.0 or above improved iOS AirPlay so the mobile screen can close and subsequent episodes can autoplay. Compare the installed application with the current official store release. This is evidence of a documented update, not a guarantee that every receiver, network and programme will behave identically in an unseen household.
Keep the unsupported TV app out of the comparison
The same help says the MĀORI+ Apple TV app is no longer supported and directs viewers towards AirPlay or other routes. A casting improvement does not reinstate that older standalone application. Decide which supported route is being tested before changing accounts or interpreting two different interfaces as the same player.
Test the actual programme and record the result
After the appropriate update, note whether playback starts, whether it stops only when the screen closes and whether the failure affects another eligible programme. Keep the device and receiver details. Programme-specific overseas restrictions still apply, so a rights message should be recorded separately from an established stream that stops at screen lock.
Questions, answered
Does the AirPlay update restore support for the old Apple TV app?
No. The help treats mobile AirPlay and the unsupported standalone app separately.
Is any playback failure proof of the screen-lock issue?
No. Match the precise symptom and distinguish a territory message from a stream stopping when the screen closes.