How to activate class ability on xbox?

[Loganithm]

I know this is a crazy question for a Steam forum (I think) but an IRL buddy of mine using Xbox One got D2 recently and says he can't figure out how to activate his hunter dodge. I thought it would be a quick search online but like NO ONE says anywhere what the default class ability control is for xbox. Crazy. And I don't want to have to join an xbox forum just to ask this. Last resort before I troubleshoot it with him in person.

[Mez Koo]

Afaik the default is double press B but it can be changed under the keybindings menu.

[Emurinus]

By default, it's double tapping B (Hunter) or holding B (Titan & Warlock).

These buttons can be rebound for accessibility reasons.