Instagram notes may not be showing up for various reasons. It's important to confirm that you're using the latest version of the Instagram app and that you've internet connectivity. Some users have reported that they received access to the Notes feature but later lost access to the feature, and in such cases, waiting or updating the app may help. Another thing you can do to fix the issue is to log out and log back into your Instagram account or even delete and reinstall the app altogether. It's also worth noting that Instagram Notes is still in the testing phase and not everyone has access to the feature yet.