If it’s not listed in the G3000 then it’s probably a case of the beacon existing in data somewhere, but not the approach.
There’s an oddity in how Flight Simulator understands ILS / Loc Only approaches because it doesn’t actually understand them based on an ILS beacon existing, but on a bit more information.
Also, with one of the latest sim updates there was a change in the standard for this information and AAU1 changed how that information is consumed to use the new standard.
If you aren’t using any 3rd party scenery (including marketplace) which it seems like you aren’t from your description, I’d report this as a bug to zendesk.