I have my CGEM DX working great with indi and kstars and also have my NexDome working with the CW/CCW buttons. I can slave the dome to the Telescope simulator and have it operate just fine. What I can't do is operate the dome with the Celestron NexStar driver (updated today so it's not an old driver).
I had a quicky look at the source and I can't find anything about azimuth in celestrondriver and only comments and park settings in celestrongps.
Looking at the telescope simulator code it looks like the celestron driver is simply missing the needed code so it can't be used with a dome.