EDIT : same problem as en/blizzard/t/cant-switch-bewteen-accounts/58169 , same fix (deleting AppData\Local\Battle.net folder) worked, this post can be discarded
All of a sudden the “Switch account” option stopped working
After a brief loading screen, I get back to the same screen where I can login to blizzard account X, but can’t change it. That makes me unable to play on my main account, only on the alt.
I reinstalled battle.net to no avail