Thanks.
Been trying to help someone else with same problem (different handset).
Came across this
Settings > Notifications > App Notifications (choose the ones you want) > go back then "Lock screen notifications" select "Show content" (should mirror choices in previous screen) bottom of this same page TAP "Notifications to show" select "Alert and silent notifications" go back then "Notification pop-up style > select brief > Apps to show as brief = All apps and select "Show even while screen is off" then go back one page > "Advanced settings" "Show notification icons" = All notifications > "Floating notifications = OFF everything else on this page is OFF except the very bottom setting "Manage notification categories for each app = ON
Back out of "Notifications" and go to "Lock screen and AOD > Always On Display = on - then tap right on the words themselves and "When to show" = For new notifications