Hi @Randi
According to your description, I have the following questions to confirm with you:
Is the meeting you created a channel meeting?
Are attendees with meeting messages on their calendars added to the optional attendees?
As far as I know, channel meetings created in the team calendar don't appear in attendees' calendars, by design. Notifications
about meetings will only have banner notifications in the desktop client settings. Check that notifications are turned on. For more details about managing notifications in Teams, you could refer to this article.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.