Sorry, I just came back to this thread. The spare keys work like a charm. We now have two remote and 4 actual door keys. I'll carry a spare with me on my "spares ring" and the other will reside on the "spares ring" we keep in the pantry at home.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i