Same issue here. I have been playing the beta on both my MAC and my PC with now issue. Got the full release today and was asked to activate. The licence key was pre-completed but the activation failed.
The log message is:
eSellerate - exit with code eWeb_ValidateActivation returned 0xE0050000 (VALIDATEACTIVATION_MACHINE_MISMATCH)
eSellerate - exit with code eWeb_ActivateSerialNumber returned 0xE0050008 (ACTIVATESN_LIMIT_MET)
Sounds like it thinks it is a different machine but i have been playing the beta on this one.
How can i fix this ?