Importing FBX animations onto rigs that dont use bones doesnt work correctly

Hello,

Im currently using the roblox avatar importer for custom rigs that i have created. But, when importing rigs that dont exclusively use bones, loading FBX animations onto said rigs either dont work or dont move correctly.

Ive searched around the devforum for answers to no avail, so im assuming im doing something incorrectly with how i go about things.

I set up a test rig with 3 separated cubes and did a simple animation with it:
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Exported as FBX, imported into roblox and loaded the animation just to find that its not working whatsoever:

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heres the test rig:
TEST_RIG.blend (783.6 KB)

Am i doing something incorrectly?

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