My ASUS ZE554KL (Android 8.0) lost its ability to sync contacts. And when I add a new contact it offers to sync with: device, SIM and that's it. Below there was a list of my Google accounts, but now there's only "Add account" as if I don't have any.
upd. Added new Google account to the device, then tried to add new contaсts, no change in the end.