@usereE2NbdhvIO I've just upgraded to the Note10 but this was an issue already on my Note8. If I wasn't looking at my phone in the time the meeting happened, the notification was gone and I had no idea I had missed anything - unacceptable!
Here's what worked for me - sorry to say but don't use Samsung Calendar, switch to Google Calendar (and don't sync with Samsung Calendar or you'll get duplicate notifications). Google Calendar is great because it will allow you to set Reminders - seperate functionality from scheduling meetings / events. The Reminder will pop up at it's scheduled time, and it will not go away until manually dismissed. It does not harrass you with constantly needing to be snoozed, it just sits there. Even if you let it sit overnight, the Reminder notification is still there in the morning. Solved my issues quick and easy, no more missed notifications!