I chose the model most close in appearance to the actual jetways
There are many models with a similar appearance in different sizes.
I loaded up a different aircraft and the jetway worked just fine.
I think I already explained, quite clearly (just like the GSX manual), the airplane position AND its door configuration is one of the several factors that decides if a jetway can work or not.
Is it possible that the jetway is trying to reach a door that it can't? For example, is it possible the jetway thinks it should go to door 1l, even though it cannot reach door 1l? I want the jetway to reach door 2l, which is the main door on the 747
If you are referring to the parking editor test function, the one activated with the 5 on the numpad, it will try (asking SODE) with to ALL airplane doors, and will report which ones will work.
If, instead, you are referring to the normal use, it's not "trying" anything, it will simply present a list of the jetway that will surely work, and the doors they can connect to. If there are none, you'll see the error.