Gmail notifications have always worked on my Nokia 8 until three days ago. It took me a day to figure it out, but the battery optimisation was doing it. How to fix?
Go to:Settings > Apps and notifications > Special app-access > Battery Optimisation
In the drop down (I think default it says ‘Not optimised’) choose All Apps. Select Gmail and choose No optimisating.
This worked for me 😀
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I was wrong. But I did find out what it was in the end;
Settings > Manage labels > Primair (check Labelalerts)
Settings > Manage labels > Social (check Labelalerts)
Settings > Manage labels > Promotions (check Labelalerts)
Settings > Manage labels > Updates(check Labelalerts)