Read customer site profile details using SOAP ReceivablesCustomerProfileService is failing

I've tried to track down documentation on correct way to return profile settings for a Customer Site but with limited success.

By implementing Receivables CustomerProfileService SOAP service, operation 'getActiveCustomerProfile', I have determined that I need to pass Account Number and Site Number in order to return the profile details.

Logical thinking is that its the Site Number in the Site Details section of the SaaS frontend…

Unfortunately when I run it it fails…

Fault Code : env:Server
Fault String : JBO-FND:::FND_CMN_RCRD_MSNG: <MESSAGE><NUMBER></NUMBER><TEXT>The record for Account ID 300000712473045 , Site Number 636082 doesn't exist.</TEXT><CAUSE></CAUSE><ACTION></ACTION><DETAILS></DETAILS><INCIDENT></INCIDENT></MESSAGE>