First Jetways for AI will work if the feature is enabled in SODE settings, and it's a setting that will only work from the next restart of the sim.
If you have SOME jetways docking and some not, it's just because the combination of the AI parking position and the jetway used on that airport is not allowing SODE to "solve" the jetway.
If the same jetway works for your airplane, it's because with your airplane, GSX can guide you to the stop position more precisely and allowing to customize it. Instead, with AI, they will always park with their center in the middle of the parking, and won't use any of the more precise information that GSX can use for your airplane, since GSX doesn't try to control or "reposition" or "guide" the AI.
Also, the user airplane has the exit position configured more precisely, for the specific airplane type ( so, for example, the exit of an FS Labs A320 can be specified differently than the exit of an Aerosoft A320 ), while with AI there's a generic database of models that comes with SODE.
That's why it's possible a jetway that works for you might not work with AI. The only thing you can do with GSX, is to customize the parking to change the jetway model and/or the position of the jetway.