I have tried to change my name in game on three different Android devices, on many different networks. It always says "contains special characters" anyone else have this problem? Level55, and tied off having the guest name. I have tried many names, never works.
Did you find a solution?
I have the same problem, trying to rename to JayBass and I get the same error. As you can plainly see my handle has no special characters in it. After testing from frustration to get any name other than guest, I found that it does not matter what I type in it still generates that error.
Using the latest version of the game for Android 6.