Please ensure your McMaster email and password is working fine to access other systems. You can verify it using the link: https://maciam.mcmaster.ca
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If your email and password is working fine, the error message might appear if your Zoom account isn’t activated, as it’s through Zoom that event registration takes place. After activating your Zoom account, you can proceed to sign up for events via Presence. You can activate your zoom account by going to https://mcmaster.zoom.us/, and signing in with your MacID@mcmaster.ca and MacID password. After signing in there for the first time, you can then go back to register for events through Presence |