Second slave key to gate not working

[Pjotr84]

After making a slave key for myself, I made one for a friend, but it turns out that key doesn't work. He assigned it to himself and has it attached to his keyring in the inventory. I even made him another key from the same original, but that one also doesn't work. Is this a bug or working as intended?

[Glennfinnan]

The person who made the key has to attune it to the other one that wants to use it.
It's just like giving somebody a permission.

[Pjotr84]

Wow, that was fast. Thanks.