I started getting this annoying message on my MMI after Installing IOS 13 on my iPhone. I found the fix at another Audi forum. Basically reset your sync for Bluetooth. Here’s the link:
https://www.audiworld.com/forums/a4.../password-must-entered-data-transfer-2975148/
https://www.audiworld.com/forums/a4.../password-must-entered-data-transfer-2975148/
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