do the triggers work fine in different games? Did you make adjustments to the controller settings, either in Game or via Xbox Accessories app, if so be sure to try and reset those. Also check if the hair triggers are being used (bottom side of the controller). If this is happening across multiple games, be sure to try this:
I'm having the same issue. Inputs from the controller not recognised at all. Left stick LED ring is on but right stick LED ring is off. No controller buttons, including command center and armour crate, are working. Anybody knows how to fix this? Touchscreen and keyboard & mouse inputs are still recognised.
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fortnite mobile controller triggers not working