Hello, I am new to using flight simulators. I am trying to run a Garmin 750 plug in from Reality XP and the Aspen EFD 1000 from Sim Innovations in Xplane 11. All works well, except I have no course guidance. When I start the Garmin 750 in the game, the test it has you do at first works only partially - DTK is not shown on the Aspen but the course momentarily shows half left. It shows no half up on the glideslope. If I select VLOC or GPS mode on the Garmin, the Aspen reacts accordingly at the bottom showing "NAV1" or "VLOC". However, no change in course or heading or course guidance no matter what type of approach I log or in what mode. Any ideas on how I could tackle this issue? Thank you very much.

Seems you jumped in the deep end. Dont use either of those, you could look on You tube someone may have done a setup guide, or find there help forum.

Open up the rxp menu from your Plugins drop-down.  I've not used xp11 in a long while.  Make sure some of the boxes are checked.  There might be something like connect GTN to VOR or HSI.