Capital Games Teamany news on a fix for swapping accounts i cant access one of my accounts due to this bug which now means i wasted money on the account which is unaccessable
Alternatively, on Android, try using "Playing as Guest" when it will ask you to log into your account, use the second account. First account is via Google Play and you should always get that second account when playing as Guest.
As schissler said, use the Play Games app.
Ive tried the guest thing i have access to 1 other account I had 3 lol but some guildies they cant access their alt at all even doing guest part