When setting up reminders for your meetings using an iOS or Android device, you need to make sure that your Google or Outlook calendar is synced on the mobile app so your scheduled meetings appear under the Video menu. To know more, visit Connecting your Microsoft or Google Calendar in mobile app
If you have both Microsoft Outlook and Google Calendar app installed on your device, you can schedule a meeting and set up reminders with both.
Note: When setting up a meeting reminder for the first time, you may be prompted to choose which app to use. For example, if you choose to open the meeting details via Google calendar, you will be redirected to this app where you can set up a meeting reminder.