The Teams Meeting add-in is not available in Outlook with your Microsoft Teams (free) account. However, if you do have the add-in and try to use it, you may receive the following error:
"Sorry, you need to sign out of Teams and sign in again before you can schedule your meeting. If the problem persists, please contact your support team."
Learn more about how to create a meeting in Microsoft Teams (free).
If you are using Teams with your work or school account, learn more about the Teams Meeting add-in in Outlook.
For more help, contact support or ask a question in the Microsoft Teams Community.