Go to https://msd25.zoom.us/ and follow the steps below which show how to login to Zoom for the first time using an MSD Google account. Future logins will only require going through the first 3 steps.
Click Sign In
Click the Sign in with Google button
Click your MSD Google account from the list or use the Use another account option if you district account does not show up in the list
Click create account
Click Consolidate into Account and then Continue button
Click Sign in button
Click the Sign in with Google button
Now you should be logged into Zoom and can join meetings