Ye i know :(
I don't know why, when i make the build xr grab interactable stops working, not a single error, just not working.
I was doing the build in different ways, for windows, for android... for more than 7 hours and I couldn't solve it.
That's why I made the trailer, so that at least you could see that it works, and I left the link on github, in case you want to play it from the unity editor. ty for the feedback :)