question

Can you provide the specifics of how you're calling GetPhotonAuthenticationToken and how you're then calling Photon with the token?

Well i don't since i thought its just the same Photon as Photon from ExitGames. Why do have to call it ? Since when im connecting to ExitGames Photon its working without. Is somewhere a tutorial how to do it correctly so i can use PlayFab's integrated Photon?

For your newer question, can you re-check how the client is making the call to Photon? After signing into PlayFab, you should be making a call something like this:

public string PhotonAppId = string.Empty;
public bool ShowDebug = true;
private string _photonAuthTicket = string.Empty;
private void LoggedInConnectToPhoton(RegistrationLinkType linkType, LoginResult loginResult)
{
    //Create our Photon Auth Token Request
    var photonCustomAuthRequest = new GetPhotonAuthenticationTokenRequest()
    {
        PhotonApplicationId = PhotonAppId.Trim()
    };
    //Call to PlayFab to get our AuthToken
    PlayFabClientAPI.GetPhotonAuthenticationToken(photonCustomAuthRequest, (result) =>
    {
        _photonAuthTicket = result.PhotonCustomAuthenticationToken;
        // you need some auth values (before we connect):
        PhotonNetwork.AuthValues = new AuthenticationValues();
        // important: select authentication type (how / where the auth is verified)
        PhotonNetwork.AuthValues.AuthType = CustomAuthenticationType.Custom;
        // the demo authentication-service expects values for "username" and "token":
        PhotonNetwork.AuthValues.AddAuthParameter("username", loginResult.PlayFabId);
        PhotonNetwork.AuthValues.AddAuthParameter("token", _photonAuthTicket);
        //Connect to the photon Server.
        PhotonNetwork.ConnectUsingSettings("0.1");
        //If we want to see info we passed, turn on the ShowDebug Flag.
        if (ShowDebug)
        {
            Debug.Log(string.Format("PlayFab Auth Ticket Received: {0}", _photonAuthTicket));
            Debug.Log(PhotonNetwork.AuthValues.ToString());
        }
    }, (error) =>
    {
        Debug.Log("Could not get Auth Ticket From Photon.");
    });
}

Sorry about bump , but is this current?

@Hamza Lazaar

"If the question is, is the PlayFab/Photon integration only valid with the Photon App IDs you get from the Add-ons page for Photon in the PlayFab Game Manager, then the answer is yes."

Is the above still the case in 2020? I only see the appid I entered.

My authentication fails when I changed the Auth-URL as per this thread :

https://forum.photonengine.com/discussion/comment/52839#Comment_52839

So instead of URL format:

https://{PlayFabTitleId}.playfabapi.com/photon/authenticate
use:
https://{PlayFabTitleId}.playfablogic.com/webhook/1/prod/{PhotonSecretKey}/CustomAuth