What have you tried so far, @Wuzzybear? All relevant notification settings set correctly on the phone and Gmail, for example?
Are you getting other notifications through?
Also, apparently there's a a bit of S10-type weirdness I've come across, where adding the relevant Gmail account to the stock email app appears to help with receiving notifications from the Gmail app.
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Has GMail been automatically added itself to 'Sleeping Apps' list. Had similar issue on S9 where got no notifications but yet when checked manually had emails waiting.
Under battery -> battery usage-> gmail -> Optimise battery usage, checked to see of Gmail is listed. If so, flick slider to off.
Hi..Haha you ll laugh.. I installed email app now I'm getting notifacations twice ..from Gmail and Email. Oh well now I certainly wont miss an email!😂😂thanks all