useNicks and colibri/debug

I’ve enabled useNicks in configuration, and using colibri rest api to view the state of the server.
For view the state I use /colibri/debug endpoint in the api.
It shows the conferences with the names, and the people that it’s inside with the ids and some nickname that do not match with the users displays names.

I mean, I put my display name (Manuel) and in the response of the api appears something like “9107927c”: “Arnoldo-P7p”

I understand useNicks:true should match display name with internal xmpp name. There is any way to do this and see the displays names through the api call?