No solution sadly, but I am having identical issues with my 12 mini (iOS 14.7) connecting to my 2011 Volvo XC70. Tested with various other handsets and all is fine, but with the 12 mini I cannot make/receive calls via Bluetooth in the car despite showing as connected. Please sort this out Apple, this is core functionality and essential for many of your customers. Over and above the inconvenience, the inability to use the phone integrated to car Bluetooth is a safety issue.
Oldsch00l
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