Did they check the "Clock Spring" that feeds power plus signals to and from the steering wheel?
A broken wire here will prevent signals getting from the wheel to the harness in the steering column. The plugs on the rear of the wheel connect to the "Clock Spring".

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i