Hello
I use Unity 5.5.5p2 and playfab plugin Version: 2.55.181114.
When I call PlayFabClientAPI.LoginWithAndroidDeviceID with deviceId 3727351137f0cebc I always get the error (ServiceUnavailable 409 Conflict).
If I change deviceId (ex. to 3727351137f0cebk) all works fine.
Reproduced in different studios and titles:
Titles IDs - 3C19,C0F8
var request = new LoginWithAndroidDeviceIDRequest{ AndroidDeviceId = "3727351137f0cebc", CreateAccount = true};
PlayFabClientAPI.LoginWithAndroidDeviceID(request,resultCallback,errorCallback);