The hearing test on one of the images shows a ‘profound loss’. Does the hearing aid feature work for such a significant loss, or does it disable for any result beyond moderate loss?
The feature only works when hearing loss is mild (26–40 dBHL) or moderate (41–60 dBHL). We had to repeat the test a few times to get it in the range and enable it.
https://support.apple.com/en-in/120991