The LookinBody Web service is account specific. You will only be able to the test results that are coming from the InBody unit(s) connected to your account, and you will not be able to see test results coming from other locations.
For your clients, they may be able to view all of their results through the InBody App regardless of where they tested, given that the other locations are also using the LookinBody Web service and the client is providing the same mobile number when testing.