Photon Unity Networking - If player is online?

How can I check if a specific player is online? A username check won’t work, I need to know if there’s a way to check with ViewID. I’ve tried PhotonPlayer.Find(id) but that doesn’t seem to work. D: Anyone know what I can use? My code is something like this:

if (PhotonPlayer.Find(255) != null) {
Debug.Log("The user is online.");
}

You only get to know which players are in the same room as you. PhotonPlayer.Find is “per room” and not able to find someone.
The full list of players in your room is in PhotonNetwork.playerList. Anyone who’s not in there is not in your room.

If you want to look up some friend’s state, try PhotonNetwork.FindFriends(string friendsToFind). Photon does not provide a user’s friend list, so you need to combine this with some community.

how do I find then?