Resolution:
There are several ways to schedule a meeting in Teams:
1) Select the "Schedule a meeting" button in a chat (below the box where you type a new message) to book a meeting with the people in the chat.
2) Go to "Calendar" on the left side of the app and select "New Event" in the top right corner.
3) Select a range of time in the calendar. A scheduling form will pop open.
The scheduling form is where you'll give your meeting a title, invite people, and add meeting details. Use the "Scheduling Assistant" to find a time that works for everyone.
Once you're done filling out the details, select "Save". This will close the scheduling form and send an invite to everyone's Outlook inbox.
Invite people outside your organization
Teams lets you invite people outside your organization, including those who don't have a Teams license. You'll need their full email address to invite them.
1) Go to where it says "Add required attendees". If anyone is an optional attendee, select "Optional" instead.
2) Type the person's FULL email address (ex: Joe@example.com).
3) Select "Invite". They'll receive an email with a link to the meeting.
Right-click for more options
1) Right-click an event in your calendar to RSVP, remove it if it's canceled, or open the invitation to view the meeting details. If the event is a Teams meeting, you'll also get options to "Join online" and "Chat with participants".
2) Teams meetings will show a join button on an event in your calendar five minutes before the start of a meeting. Once someone joins the meeting, the event will change colors to let you know they're online.
3) Select "Join" to open the meeting settings window to confirm your preferred camera and mic settings before joining the online meeting.