Custom Mesh Rig Is Not Playing A Looped Animation

I have a custom rig which is a mesh. And I have created an animation but it is not playing and the Rig is just T-Posing in game. I have checked multiple tutorials, but none of them show how to make a custom mesh rig work, they all show rigs from parts.

My end goal here is to make my custom mesh-rig play a looped animation when I am in the game.

Also here is what the default rig after I import it looks like in the workspace:

If someone knows, please tell me how to do that and please describe everything in as much detail as possible.

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can you provide the script thats playing the animation