Thank you for reaching out! I have just tried the referral link you’ve shared and for me it’s working nicely.
However, you do have a typo in the link. The domain name is missing.
Please make sure to add the domain name.
This is the link you’ve shared: http://www.wau-statt-au/shop/bonus/1/
This is the link including the domain: http://www.wau-statt-au.at/shop/bonus/1/
Thank you and best wishes,