Create Player does not ... create a controller in a simple local multiplayer game

I followed recently a video to set up a simple player spawn in a multiplayer game :

After some problem and troubleshoot I tried to isolate the issue and I come with this :
In my game mode just after the begin play I create player with ID 0 and another with ID 1 for a second player controller.

The log tell me that it has failed to create player because controller ID 0 already exist which is normal.

But it also just does not create at all the second player controller… even if I only create a player with ID 1.

Anyone has ever experienced this problem ?