Thank you everyone for your comments.
This is not really a ‘I can’t get profiling to work’ issue but rather an ‘Apple won’t let you profile’ issue.
Quoting from Apple’s website:
“Change your Mac display’s colour profile
In Displays settings, you can switch between different colour profiles. Your Mac selects the recommended profile for your display by default, so it isn’t usually necessary to adjust this setting.
Note: Certain Mac models use built-in reference modes rather than colour profiles. If you have a Pro Display XDR, an Apple Studio Display, a 14-inch MacBook Pro (2021) or a 16-inch MacBook Pro (2021), see Change Displays settings.”
I have found that Apple's profiling and calibration of its displays quite good although on balance I would prefer to make my own profile. But, on newer displays Apple have removed this option giving you instead a series of what they call ‘presets’. You can use their controls to make your own preset but the emphasis is on viewing conditions rather than measuring the display to make a profile in order to colour manage it.
So really my question is more to do with whether not being able to profile Apple displays is an issue; or not ?
I'm agnostic, but I would like to know what others think.