Hi,
Please check the setup of cfolder first following these steps.
cFolder Settings for SAP SRM - Basic Settings for Strategic Sourcing - SAP Library
Then check if this BADI is used.
BBP_CFOLDER_BADI. In the COL_MODIFY_URL method, please update with sap-client=xxx to url.
or
In class /SAPPSSRM/CL_TECHBID_CFOLDER
/SAPPSSRM/IF_TECHBID_CFOLDER~GET_URL_TECHRFX please update with sap-client=xxx to url..
Best regards,
Rohit