Welcome to the AGL Community!
Can I ask if you've linked your Flybuys card with your AGL account? If you're not sure, I'd recommend logging into your AGL My Account here and then navigating to the 'Rewards' tab. This page should give you a good indication of whether or not your Flybuys card is linked.
If you're still not sure, I encourage you to attempt linking your Flybuys card with your AGL account here.