Hi Dinesh,
please check SAP notes: 1773526 - Invalid SAP User and 1862144 - Minimum roles required for any user to be visible as a firefighter user
You need to check the parameters 1000 (The Plug-in Connector) & 1001 (The GRC Connector) in the Plug-in system.
Make sure your RFC user has all the required authorizations. RFC user has SAP_ALL profile
RFC connection should be Trusted. Please check SAP note 1701047 - Is it mandatory to use trusted connection in the RFC destination for Firefighter Connector?
Check FF user has authorization to ACTVT 03,05 and User Group * in S_USER_GRP Object
Make sure the role name maintained parameter 4010 is assigned to the FF ID in target system.
Make sure EAM master data synch job is running.
Regards,
Madhu.