RPC NOT WORKING

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Hi everyone, I'm tring to send mob life in a multiplayer game via rpc to all clients, but my problem is that looks like it's not working, because when I try a windows build and Unity Preview I can receive data from windows client to Unity client, but when I try to send from unity client to windows not working.

The code I'm using is...

_this.RPC("MobPoint", PhotonTargets.Others, lifeBar.name, playerPower, mobHP);

And to display the data, I'm using TextMesh Pro.