My LANG variable was set to "en_US" in both the ...api/bin directory as well as for user:oracle.
We were able to backup RMAN to disk successfully. As this is a new (replacement server) for one of our SP nodes, I copied the license file from this SP node onto the new server and then downloaded/installed TDP2210. I have ordered the TDP 22 installation media and will try a clean install of that when I get it. I'll keep you posted. Thanks to everyone for the help thus far; Theresa