5 Users set up, still time shows as busy when trying to make appointment

I have followed every instructions I could find; I have setup additional new WP users (4), on Appointments+ > Settings > Service Providers I have checked them as Dummys, have set all Users as Service Providers for all services and still whenever you book an appointment that time becomes busy. I would like to have 5 available slots fro each service for each time.

Please explain to me in detail how do I achieve that.

Thank you.