When setting up your account for Out-Call, or Mobile, services, MassageBook allows you to set a Travel Radius as well as select cities/areas within that radius that you will service. MassageBook uses Google Maps to determine if the address the client enters falls within the radius and cities/areas that you selected in your Out-Call Settings.
If a client is presented with a message that "No providers available to service this location" when booking online, it means that Google Maps has determined that the address they entered is either outside of your travel radius, or in a city/area that you have deselected.
If the client's address is an area that you wish to service, you will need to determine the city/area that Google Maps considers the client's address to be included in, and update your Out-Call Settings to include that city/area: Out-Call Settings Overview
Note: In this scenario, MassageBook suggests selecting all cities/areas in the list to ensure the client is able to schedule successfully. Then, individually deselecting cities/areas that you do not wish to service to work backwards and determine the city/area in which Google considers that address to be.