The SOAP API invalid response unknown license key '1' may occur when the Virtual Traffic Manager (vTM) is licensed to a Service Director (SD). The SD sets the license filename as 'universal_v4' instead of the license serial number which the SOAP API is expecting.
Workaround- make a copy universal_v4 license from the SD; then from the vTM web UI: (System > Licenses) remove the existing license key and add the license key file back. Do not relicense the vTM from Service Director as the file will revert back and return to the same error state.
