Melodics x Pioneer DJJ-REV1 Campgain Promo Code

https://melodics.com/partners/pioneerdj

The link above says:
Enter your Pioneer DJ Serial Number to unlock 40 free finger drumming lessons and an exclusive Pioneer DJ course that will move the needle on your pad skills.

However, I receive an invalid error code when entering the device's serial number. Is there anything else I need to add besides the serial number? I would appreciate it if someone could help me!