Cliff Climb chest error

Playing on an Xbox series S console and there's a chest on the Rivain Coast that won't bring up the RB prompt to be able to use a companion ability. 

I think the area is called Cliff Climb, it's the area you have to climb up to and there's a wooden walkway with Venatori attacking you. Below the walkway and to the left, back towards the main area, there's a building with a crack in the wall - inside is a barrel you're supposed to blow up with a companion ability. 

No matter the angle I use, how close or how far I am, the button prompt will not appear and I cannot access the chest. I have watched videos of people doing it, so aware of what should happen. I have loaded in several times and visited at several different points, it doesn't matter. Thanks!