Can I join a Teams meeting without having an account?

Open the meeting invitation and click the meeting link ("Join" or "Click here to join the meeting").
Choose "Continue on this browser". This allows participation directly from your web browser (Chrome, Edge, Safari, or Firefox without installing the Teams app or registering for an account.)
Enter your name and select your audio/video preferences as prompted.
If using a mobile device, download the Teams app when prompted; you can still join as a guest without signing in

Yes, it is possible to join a Microsoft Teams virtual meeting using a meeting link without having a Teams or Microsoft account.