I have exactly the same issue and it has now been the cause of me either being late to or completely missing out on a handful of meetings. There is no option in the settings for "remind me for all meetings", I have to go in manually and set in the meeting reminder for the meeting in question
Outlook does not notify me for all meetings

Lauren Flatt
1
Reputation point
Within Outlook, I get reminder notifications for any Teams/Outlook meetings. However, if there are any meetings on my calendar that use Webex, Zoom, On24, etc. I do not get a reminder notification for these. Is there a way to get reminder notifications for all meetings, regardless of the meeting platform, as long as they're on my calendar?