I've had this issue too on my 2020 X5 M50i running 11/2020/70.
I've found that 90% of the time when I reset my iPhone (power down, power up), it starts to work again. Only happened a few times.
The remaining 10% of the time, it's usually remedied by doing the iDrive reset (holding power button in for 20-30 secs).
Good luck,
Adam
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