Hi HMwkr,
Please try the below mentioned steps to serialize Elements:
1. Generate prov.xml usng the command:
adobe_prtk.exe --tool=VolumeSerialize --generate --serial=<<Volume SN>> --leid=V7{}PhotoshopElements-EMT12-Win-GM --regsuppress=ss
2. Serialize using the command:
adobe_prtk --tool=VolumeSerialize --provfile="absolute path to prov.xml"
Please let us know whether it worked.
Regards,
Romit Sinha