All,
The latest ASOBO exporter ver 1.3.0 (ASOBO ver =1, Blender minor version = 3, ASOBO exporter patch =0) will work with Blender 3.1, 3.2 and 3.3.
It will NOT work with Blender 3.4 or 3.6, as there is a Blender breaking change in renaming the MixRGB Shader node.
You should remove any legacy Vitus exporter as it is no longer being actively updated. And it will interfere with the ASOBO one.
You should use the Edit Preferences menu in blender and select the add-ons button and search for msfs. If you find it then open it, using the triangle to the left of the name. Click on the remove button.
You may want to ensure that the legacy Exporter add-on is totally removed by checking the Blender files in AppData folder and also the scripts/addon folder in the Program Files - but this is not necessary.
Once the legacy exporter is removed, then close blender and reopen Blender.
Check that you have not inadvertently deleted or disabled the core Khronos gltf code (version number is dependent on what version of Blender you have) - This is is required for the ASOBO exporter to work. You should see the "Import Export: glTF 2.0 format" add-on. (search for gltf)
My suggestion is to follow the install procedure outlined in the latest Readme (git repo from Jan 27, 2023), that is to use to Edit Preferences Install Tab and the zip file named io_scene_gltf2_msfs.zip.
DO NOT USE the git download of the entire main branch, as this has the wrong folder structure for the Blender install. Use the release download, not the main branch download.
Follow the instructions on the latest readme for the preferred method to remove/install the ASOBO exporter.
EDIT: also Blender 3.3 needs you to set the animations export optimize checkbox, in order that animation names are not duplicated error is suppressed.