You do not require an account or software to join a Teams meeting.
Joining a Teams meeting without an account: https://support.microsoft.com/en-us/office/join-a-meeting-without-a-teams-account-c6efc38f-4e03-4e79-b28f-e65a4c039508
NOTE: some users reported difficulty using Chrome to attend as a guest or download MS Teams – we have not encountered this issue. UNA computers include 3 browsers in the Macintosh HD>Applications folder, you may need to use Firefox or Safari instead.
You can attend any Teams meeting from your web browser. https://support.microsoft.com/en-us/topic/download-the-microsoft-teams-app-6542b675-9458-bb97-e766-a6f7b8d6e12f
Optional
Download Teams from this link: https://www.microsoft.com/en-ca/microsoft-teams/download-app
Teams is free to download. The licence for scheduling meetings etc. is not.
The Employer has purchased licences and they can invite anyone to be a guest without an account at a meeting. They have to be aware to do so when they set up the meeting.
Joining a Teams meeting without an account: https://support.microsoft.com/en-us/office/join-a-meeting-without-a-teams-account-c6efc38f-4e03-4e79-b28f-e65a4c039508
You can attend any Teams meeting from your web browser. https://support.microsoft.com/en-us/topic/download-the-microsoft-teams-app-6542b675-9458-bb97-e766-a6f7b8d6e12f
Only download the app from the Microsoft website link above – not one of the other “hosts” (i.e. softionic, digitaltrends, or macupdate) as they can contain embedded malware.