Just to add to this, for this particular problem, they can also try using this:
-bypassgpucheck
This has to be entered in the Bnet launcher, under game settings for Diablo IV. In there they have a check box for Additional command line arguments. Check the box and add that above to the empty box.
It will then skip checking the GPU.
If it doesn’t like the driver, it can still have other issues, but it should let it try to run.
I used this trick to get Diablo IV to run on an older version of the driver without issue with the AMD test gaming box I built the other week.