Currently, there are 4 levels of users: Product Owner, Contributor, Reviewer, and Viewer. Specifically to the Reviewer level user, it was discovered that Reviewers are not able to add in a Public Comment in Aha (from the Aha Product Portal) for Ideas. Reviewers can add Private Comments, but not Public Comments.
Reviewers should be able to add both types of Comments. I have attached an email thread with my use case and request.
As noted, Reviewers can only add Private comments to ideas in Aha!, while Product Owners and Contributors can add both Private an Public comments in Aha!
When a public comment is posted on an idea via Aha!, the comment is posted as an Admin user (see attachment). This allows your product owners and contributors to post an official public response to the idea (versus a reviewer who as a result of their permission level, likely should not be responding to ideas in an official “admin” capacity.
With this in mind, Reviewers can post Public comments in the ideas portal, where they will not be designated as an "Admin."