Question Character pose stuck and doesn't move

Hello

What would cause the character's body to get stuck and refuse to animate like this:

(Even the model is shocked by his current state!)

Here are the steps of my process:

1. Import a character.
2. The character has embedded animations inside it, a T-pose and another move. Both work fine.
3. There is an animation folder with the character, with separate clips, including a T-pose clip. None of them work.
4. I checked the embedded avatar, only some finger bones were not in T-pose, so I enforced T-pose and clicked apply. All bones are green now.
5. Still animation is stuck.

Please what are the possible causes? I am new to these types of issues, so any guidelines are much appreciated.

Thank you!

 

Update: The problem was with the Avatar. Even though the avatar seems to be configured correctly, removing it from the Animation Controller (set Avatar = None), made the character animate correctly.

What I don't understand is that why would the embedded Avatar not work? Even before enforcing the T-pose it didn't work.

Thank you.