Copay assistance card issues

Hi all, I got prescribed dupixent for eczema. I registered for the dupixent copay card and gave the pharmacy the info. My insurance approved the prescription. The specialty pharmacy is telling me my copay is $4000. When I call dupixent, they tell me my copay should be $0 since I have the copay card. Did anyone else have this issue? Does dupixent reimburse me if I pay the $4000?