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You need an account before you can use the authenticated parts of VOS. Public tryout signup and public tournament pages do not require sign-in.
1

Open the app

Go to app.volleyballoperatingsystem.com.If you are not already signed in, the app sends you to the hosted login page at auth.volleyballoperatingsystem.com.
2

Complete login

Enter the email and password for your VOS account. After login, Cognito returns you to the app.
Sign in card with email address field and Next button

The hosted sign-in page asks for your email first.

3

Confirm your role

The sidebar shows your name and the role you are acting as. If you have more than one role, switch it before you start work. See Roles.
Public tryout links (/y/...) and public tournament pages (/t/...) stay readable without an account. Use Have an account? on a public tournament page if you want to sign in and return to that tournament.
To sign out of this device, see Logout.