Just purchased Nokia 8 and upgraded to Oreo 8.0.0 (coming from Nexus 6 and a big fan of stock android), great phone but I have one serious issue I cannot solve. I do not get sms (or other like skype, messenger etc) notifications poping up and waking the screen, I have tried all possible settings in Settings>Apps & Notifications>Notifications etc and from inside all the relevant apps internal settings. Additionally I have tried to find a solution in forums etc. Nothing seems to work, the only time the screen wakes and pops up a notification is when I get an incoming phone call. Any help will be appreciated I am starting to get a little disappointed and thinking of returning the device.
You need to install an app such as Glimpse: https://play.google.com/store/apps/details?id=de.nullgrad.glimpse