747 SET IRS POS Not There

I see you are on PC, could you test again using safe mode (it will disable your community and marketplace addons): once into the sim, go to your Windows Task manager and terminate msfs.exe. Restart the sim and you’ll get the safe mode option.

Check out that related topic where in safe mode it worked, what indicates a mod/addon conflict issue: 747 Inertial Reference System not working after update - #14 by Nascimento1701