What I was trying to do is:
to open a new level with the listen option when a player selected to create a new session. This level is a pre match lobby, simply just another menu which gathers all the players before starting a match.
This was actually resulting into another issue and that’s where the ServerTravel comes to help! Thanks for letting me know of it!
The problem I was having, was that the clients that were still in the main menu doing nothing, were automatically “teleported” to the project template default map when the server pressed the create new session button.
Really weird, because I created a new clean project and it’s now working properly, the clients only move to the pre match lobby on find match button press and everyone gets loaded to the game map when ready, using the ServerTravel command. Thanks again!