Thank you for your post!
I reached out to my team regarding this issue and was able to replicate what you were seeing as well. Unfortunately, getting the "notes" section of an Enterprise App is currently not supported.
If you have any other questions, please let me know.
Thank you for your time and patience throughout this issue.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.