Appointment+ fields in profile are grayed out

Hi there,

When I go to Users->All Users and select any service provider user account, the appointment+ fields and Google Calendar API fields are grayed out. Therefore I'm unable to set up Google Calendar API for individual service provider.

The only user account that doesn't gray out is the first admin account which I've created when installing wordpress. It's kind of strange, I even tried changing the roles of the service provider but it's still the same.

Thanks!
Nelson