Nable to submit app after Marketplace changes – error about pending notes, but no new notes found

When attempting to submit the app for review in the Marketplace after applying new changes, I receive the following error message:
cannot submit the app for review with pending unacknowledged or replied notes

However, I am unable to find any new notes in the submission to acknowledge or reply to. This is preventing the app from being resubmitted successfully.

Hello,

Please make sure you expand notes to see the thread within each notes.

Regards, Kwaku