For NWBC related configurations....
refer here Configuration: POWL INBOX (IBO_WDA_INBOX) - Manager Self-Service (WDA) - SAP Library
POWL Inbox configurations for Manager Self-Service EhP5 and above in addition to the discussion I have already shared it with you HCM Processes and Forms Unable to approve from ... | SCN as well as this discussion POWL Configurations for HCM Processes and Forms | SCNPOWL Inbox configurations for Manager Self-Service EhP5 and above