AR video in iphone doesn't loop

Hi, I'm using the AR Foundation in Unity for an AR app, there are some images as a marker and when I read them the app start the reproduction of an animation.

In Android it works perfect, but in IOS the animation doesn't loop, it's like the iphone just stop catching the marker, because the app play de animation but in some point the animation just stop, and I have to move the phone and look the marker again.

How can I make the animation loop works??.

Thanks.