Another thing. Daz accounts are tied to your email accounts. And I used a different email address to order the Hex upgrade from Eovia than the one used for my Daz account.

Daz evidently used the Eovia email address from my upgrade to make a new account.

Try this. Go to Daz and log in using the email address you used with Eovia. Enter anything in for the password, because you don't have one yet.
This will bring up an error screen and give you a 'recover password' link. Follow the directions in the email to get your account operational.

When you access your new account you should find your $100 voucher and your PC membership will be operational for this new account.
This is how it worked for me with the $99 upgrade from Hex 1 to 2.

FWIW