Some apps can't see Google accounts: "Account already exists on this device"

[petefoth]

See my response in the other thread you posted:

Installing gapps

It is not going to work. microG and Google apps (whether from Google, NikGapps, MindTheGapps or anywhere else) cannot co-exist. Installing them on a device with microG will cause unoredictable problems and is not going to work. What is the problem with WhatsApp? I use it on a ROM with microG built-in, and it works fine