Purchased FE via Stardock website. Took serial number and activated on Steam. Installed game. Launched, and was presented with an activation screen for FE (2nd level DRM?).
Enter in valid Stardock account information and the serial number from the Stardock account products page, and.. it tells me the serial number is invalid. Attempted with the same serial as presented in the purchase email.. still invalid.
Started a support ticket #QRO-333-70584, though given the track record on my other ticket for a different piece of software (4 months unresolved) I'm dubious about support. It would be nice to get it sorted out so I can start using the product I paid for.
Edit: Move to FE Support subforum.