This is SO COOL!!!
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OKAY... so what i did was
delete the default cube,light & camera...
then instead of importing .fbx from blender
i pressed "N" and open the ggt panel in the right side...
then under Character utilities > armature
I initialize the T-pose .fbx file
then join animation this time don't select the T-pose just the rest of all your animation.
then export from the ggt export character.
hope this helps.
(i was too confused in the beginning but after multiple tries this helped)