Still not working for me.
Samsung S7, just got Oreo update and unread indicator/count not showing for emails (Samsung stock email app) or WhatsApp or Facebook messenger, maybe others. Text messages indicator works.
Tried all the suggestions in here, have all my settings as they should be and haven't installed anything else recently either prior too, or after the Oreo update.
Before these suggestions I uninstalled and reinstalled WhatsApp (the first one I noticed it on and o ly one I really care about), had a problem with my chat backups but that was a WhatsApp issue not Android. Sorted that out, got everything back including the unread message count, yay!...
For an hour, then it went again.
Tried Safe Mode, indicators working for texts still but not emails. Both stock apps. Obviously third party apps were deactivated.
Really frustrating, anyone have any other suggestions? Is there somewhere to report this officially?