For an unknown reason the notifiaction dot stoppped working for Whatsapp on my Nokia 8. I had to uninstall and reinstall Whatsapp for it to start working again, no combination of settings would make the notification dot come back.
Mine notifications never worked!!!
Factory reset the device is not a good solution.
Try to clear the cache and data of the Launcher 3 app. Do not force stop or disable, just clear the cache and data. You will have to rearrange your app icons after that, as the procedure will make your phone's desktop return as it was out of the box.
Is launcher 3 the nokia stock launcher? Cause I did not install any launcher app from the play store.
And how to clean up the cache and the data, can you discribe? Cheers
Launcher 3 is the standard launcher for phones with pure android. It comes preinstalled.
Go to settings > Apps & Notifications > see all apps > Launcher 3. Select storage ant tap on clear cache and clear data. Go back to desktop. It may take few seconds for the phone to return to the original menu.
I am not sure this fix may work at 100%, but it is worth the try. Remember that you will have to rearrange the icons in your desktop. I do a screenshot before doing this :)
Actually the tech guys gave you the proper answer here as they Identified where the problem comes, which is the Launcher 3.
It is normal when you install a new launcher he will mess up with the original one. So what the tech said was ok.
Since they cannot know where users have been in the menus and what they change, logically they will make you reset the Launcher 3, which is the native one.
this is a known bug actually and it used to happen often in Nougat, where the notifications could not be cleared.