Use Google Chrome web browser and open a link you received.
After clicking on the link, a web page opens where you will see two options: »Download Windows Application« and »Run Teams in a web browser«. If you already have the Microsoft Teams desktop application installed, it may start automatically or you may be prompted by your browser. If you don't want to install the app, select »Cancel«, and then select »Run Teams in a web browser«.
Before joining, you must enter information about the participant "First Name Last Name". If you are prompted for permission to use the camera and microphone, please allow. When you're ready, click the »Join Now« button.
he meeting organizer will allow you to enter the meeting. If no one accepts you for the meeting in 15 minutes, you will be removed from the meeting. If this happens, you can try to join again.
More information: https://support.microsoft.com/en-us/office/join-a-team-as-a-guest-928d1eef-61e2-49ec-b754-c2fe86b34824