I'm not playing since a long time but I've just checked if PS is still able to run on my Mac (10.14.5) and it is.
So, even if I can't exactly tell what the problem could be
I can tell for sure that every problem I stumbled on, years ago, trying to have a working client was solved reading here:
Players GuideHope this can help
(also, PS should work... it's expected to be not working after updates to OSX 10.15, since it is a 32-bit app, but it is expected to run on Mojave!)