New problem started about 8 hours ago. Game worked fine, changed accounts and boom...

Tried reset, deleted game and reinstall several times, even did network reset, all to no avail. Same happened on my iPhone. Go in normal is fine, but the moment I tried to link to another account I cannot go back in.

I'm stuck and now cannot get into MW on iPad or iPhone so cannot open support case even! Anyone else with same issue in last few hours?