I have been wondering about this for a week now, you see I tried Photon Unity and instantly knew that this was a great choice for my game. But the problem is, normal register scripts don’t work well with Photon and I’m trying to make my game so when you open the application it instantly goes to the login screen. I just don’t see how i can make a register and login script with Photon.
Any Ideas 
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Login / Register is not supplied by Photon (yet). You can do this with any solution available for any community and even mix if needed.
The player name you set in Photon is not checked in any way, so just do your login first, fetch a name or use the entered one and apply it in the PhotonNetwork.player.
We are working on a authentication feature which will work with external solutions directly. In that case, Photon authenticates the user to check if access to Photon should be allowed or not. But that’s in development still.
I would be really interested in this authentication feature as well! Any ETA on releasing that?