For future reference with how the referral can work: you would send the link to your friend to create a new Oculus account through. After, they would purchase a new Quest 2 from an authorized retailer. Upon headset activation with the new account, they would receive the credits within 7 days. Whereas, you would receive yours within the next 30 days.
Since neither of you received it, your best bet is to reach out to the team.