Hi @vivek, if you're trying to Joining different meetings simultaneously on desktop, you will need to have a Business, Enterprise, or Education account. You can look more into joining different meetings simultaneously on desktop here.
Also take note: you can be signed in to Zoom on one computer, one tablet, and one phone at a time. If you sign into an additional device while logged into another device of the same type, you will be logged out automatically on the first device.
