Same DevEUI under two accounts

We have the several same DevEUIs under two accounts, one is ours and the other is our client’s.

They are online under our client’s account, but we can still add them to the network. Does anyone know why this is allowed by the platform? It was not allowed before. I appreciate your answer.
Also, what is the results of this problem? Is this a bug or we did not configure it correctly?

Thanks very much.

Corbin

Check the documentation - reference section - constraints.

It’s the combo of Dev & App/Join EUI that has to be unique.