Reserialize Acrobat DC Standard to Professional

I am using the command adobe_prtk --tool=ReplaceSN --serialize=LEID --serial=<new serial number>, but in the oobelib.log i am getting a return code 6. The error is "undefined CAPS error 10, while accessing payloadcode corresponding to leid"

I am using "V7{}AcrobatESR-12-Win-GM-en_US" as the LEID

Adobe_prtk.exe is from the DC Customization wizard, version 9.0.0.301

What am i doing wrong?