Can't sign in?
I forgot my password
Go back to the sign-in page and choose "Forgot password?". You'll get an emailed link that expires in 30 minutes. You'll still need your device or your authenticator app afterwards.
I lost my phone, or I'm on a different computer
Sign in with the other method you set up. If you registered this computer, use "Use this device". If you set up an authenticator app, use the six digit code. Either one works on its own.
I've lost both of them
Use one of the ten recovery codes you saved when you set up your account. Sign in with your password first, then choose the recovery code option. You'll be asked to set up a new device straight away, so you're not relying on the codes.
I don't know which email address to use
It's the address your invitation was sent to. Search your inbox for a message from CAST. If you can't find it, ask whoever set up your account to check it or send a fresh invitation. For security, we can't look an address up for you here.