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How does BMW set the driving authority of shared keys?

After setting the master key, share the key in the wallet through iMessage.

Settings-Information-Line 2, click the number, and then use imessage to log in the account information. The default mobile phone number for using imessage is invalid. You must use an apple account to log in to imessage.

Each user can only use one iPhone to install and activate the master key. Users can send invitations to up to 5 friends and relatives through Apple Wallet to share the use of BMW digital keys. Instead, every authorized user (owner and invited relatives and friends) can install the digital key in the Apple Watch associated with the authorized mobile phone. In this case, each invited relative will display two available numeric keys.