Hi TCIAdministrator-2032,
What is your license?
The following table lists the license you need for organizing and hosting meetings:
Anyone can attend a Teams meeting for free – no license is required.
So, if the meeting organizer meet the license requirements, you can invite guests to you Teams meeting.
For more details, please refer to:
https://learn.microsoft.com/en-us/microsoftteams/quick-start-meetings-live-events.