you have 2 logins. 1 for the forum. and 1 for the buddyauth, you dont register specifically for the store. you use your buddyauth login to log into the store.
if you havent register at Home Page - Buddy Auth Portal with the same e-mail address you used during checkout.
once you get in you should be able to view your keys. your key should be listed.
after that use the same login to log into the store.
Login was unsuccessful. Please correct the errors and try again.
This account is not yet approved. Please contact support at [email protected]
Ive tried Resend Activation Email, for two days and still haven't received it.
It sounds like you've run into an issue that only the Bossland GmbH 'front office' ([email protected]) can assist you with. Only the front office—not the Support team—has access to the tools needed to check and manipulate your account.
While waiting for them to respond, if you'd like to double-check the Authentication Portal and getting you account set up correctly, these articles should help: