I have tried everything to get the screen time reporting and limits to work on my son's computer. Activity reporting is still enabled (he is 13 and could shut it off, but has not done so and is not allowed to do so by his parents). The device (the laptop) shows up under his microsoft account generally but not under screen time limits for Xbox. The instructions for adding a device under screen time for Xbox just take you through the steps to achieve what has already been done - it's linked to his MS account already, just not showing up under Xbox.
Can I just say that the lack of operational screen time limits for both MS and Apple devices seems awfully intentional given that neither has provided an appropriate fix in YEARS?
If I cannot fix this, I am taking the laptop away. It's not my preferred solution but this has become more problematic than it's worth.