Maybe the elevation-level is not set correct.. it is not displayd in Your elevation because its Higher or lower inserted.
Quick workaround:
Try it in an extra Archicad session and copy it into Your Project.
Then Al+Klick on the inserted and the next should work
AC5.5-AC27EduAut, PC-Win10, MacbookAirM1, MacbookM1Max, Win-I7+Nvidia