Using the ADDRESS SDSF host command in an OPS/REXX results in rc(-3).
OPS/REXX does not have an ADDRESS SDSF host command that is the reason for the -3 return codes.
ADDRESS SDSF is supported in a TSO/E REXX. Execute the TSO/E REXX from an OPS/REXX with the ADDRESS TSO "EXECUTE tso.rexx.program". The results from the SDSF command can be stored in global variables in the TSO/E REXX, with the OPS/MVS command processors OPSSETV and OPSGETV, so that they can be accessed in the OPS/REXX.