It’s in the Spartan Assault and Spartan Strike forums. Many users are having sign in issues on both games on the windows 10 devices. I tried Xbox support and they directed me here. I have not found any official response from Microsoft yet and it’s frustrating. I picked up Spartan Strike and I have not even been able to play it. Are the teams aware of the issue, and is anyone working on it?
I’m having the same issue! Very frustrating and quite frankly unacceptable for a game that I purchased.