I CHANGED MY ACCOUNT WITH VIDEOTRON

It sounds like the switch caused a bit of confusion with account setup. Usually, after downloading the app, you need to register using your phone number or the details you provided when signing up with the new service. If you’re still unsure, I came across some helpful info while checking  Levy property search that explains how account registrations generally work on similar systems. You might also try contacting customer support directly, as they can guide you step by step.