Hey,
I am trying to get to "Product page optimization" section on app store connect, but the whole "Feature" on the left sidebar doesn't exist.
I have an "Admin" role and the app has been out for years now, do I need to update something? or is there a specific agreement I might missed
The "updated App Store submission experience" is something that you had to sign up to.
It will automatically roll out to all developers on 25 January.
{This includes the product page optimization feature}
If you want it before then, you can still sign up for it:
https://developer.apple.com/app-store-connect/submission-update/enable/
Follow the link and press Update at the bottom: https://developer.apple.com/app-store-connect/submission-update/ . Then press "Enable". It's going to activate all new features for your account.
All new features are going to be available by default after January 25, 2022.