4.6 has broken Google Play login for me, after it had been working for ages. LG G7 running Android 9.0. I use two different Gmail accounts on my phone, but only one of those for GoW. Sometimes but not always, when I launch GoW, it will prompt me for which Gmail address to use, and then it will login.
A related issue is that when I exit the game from the menu, it leaves the client running in the background. If I then try to run GoW again without first removing the client from memory, the game will auto-close to the desktop. A second attempt to run GoW will launch normally, at least until it gets to the Google Play login.
Devs need to get a clue about how Android works!!