If you have json output that looks like availability information then the script has successfully run, otherwise you will need to check the arguments you supplied were correct, if you supplied more than instanceId then they are comma separated.
If holdings are returned then it also checks the details for the first instance returned as a check to see if the correct rtac module has been installed, if you receieve the message
"Unable to locate one of locationCode, materialType.name or library.name, does the folio tenant have the correct rtac module installed"
then there is a reasonable chance that an incorrect variant of RTAC is installed on the folio instance.
whereas if you received the message
"The locationCode, materialType.name and library.name properties have been detected, therefore the correct rtac module is installed"
Then the correct variant of RTAC is installed as all the additional pieces of information we expect to receive are there.