Steps to reproduce:

• Connect XBox controller to a device running Steam Link
• Verify Steam Link detects the controller as XBox
• Connect to Steam
• Launch WoW

Expected Results:

Xbox controller properly works

Actual results:

Mappings are broken.

Workaround:

Connect controller via bluetooth to device being controlled by steam link, if possible

Such issues have to do with whether the game can see and interpret your controller correctly. Not an addon issue.