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Support for adding Drivers Licenses on iOS 15 was delayed. It is not yet available. It will come in a future iOS 15 update.

https://9to5mac.com/2021/09/20/these-ios-15-features-wont-be-available-with-the-official-release-next-month/

This feature wasn't launched with the current version of iOS 15. Use the following resource for information on iOS 15 updates:

https://support.apple.com/en-us/HT212788