Trying to setup Paypal sandbox account

I am trying to setup a Paypal sandbox account. I am using the guide on the gravity form website and I am at the section to login to Paypal Manager. When I try and login with my Paypal account, it goes back to the login page with the error “Error: This feature is currently not available for your account. We are working to bring this feature to you soon.” Does anyone know how to continue setting this up?

Hi Melissa. Please contact PayPal for support with this issue. Thank you.