It appears that this issue has been ongoing for approximately 10 to 12 months.
Madmax_Hart
This probably means the period since H265 and AAC >32k is possible ..
.. but before that it didn't work for years - just for clarification the info from before:
[quote=Wilson.Wang;n387865]Apple TV+: All regional countries, 720p videos
(* The new released videos (
after 2021/11/01) can only be downloaded up to 480p.),
H264 Codec, AAC 2.0 audio[/quote]