If a learner can't leave a comment in a peer review task the most common explanations are:
- There is no comment to review yet. If no other learners have completed the related comment task, the learner that is first need to wait for a peer to leave a comment for him/her to review.
- The peer review task is not connected to a comment task. Make sure that it's connected by entering the admin view, go to the program and check if the peer review task is connected in builder: