Adding comments to 360

One of my storyline reviewers is saying that she can't add comments to the slides when reviewing the course. She wrote that "You may need to enter our email addresses in order for us to be able to add comments to the right of each slide. I tried and it doesn’t let me". As far as I know I don't need to/can't add e-mail addresses of the reviewers. Why can't she add comments? (comments are enabled by the way)

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