UNABLE TO SEAT WORKSTATION: FQDN MISMATCH, FDQN1=

This happens when a machine with a working copy of Retailpro9 was added to a domain.

Resolution:
Their lincese was activated on a workgroup then they put the computer on the domain, that changes the hardware sig, have to put it back and deactivate the license, put it back on the domain and then reactivate.