I have tried to approach AGL on this issue many times and have often been promised action. NONE EVER COMES. I have not been able to access Rewards for two years.
Welcome to AGL Community!
I highly encourage you to have a read of this thread AGL Rewards - unavailability in My Account FIXED as this may help.
If so, please send me via private message a screenshot of your My Account page including your account number and I will have it looked into. To send a private message, click my name.