Problem adding Home Key to wallet for Aqara Smart Lock U100

I was having trouble setting up a Home key in my wallet for use with Aqara Smart Lock U100.

There was a previous discussion that was closed without resolution, but I have some advice that others might be helpful.

You must add the lock to the Home app using your iPhone in order to generate the key card in your wallet. I had initially added the lock to Home using my iPad. While this will also add the lock to the Home app on your iPhone, the software will not generate the key and there does not appear to be any way to add it later.

If you did not initially add the lock on your iPhone, delete the lock from Home and add it again using your iPhone.