Annotation authorship not showing

Hi,
I have a group library with two other people. When I view documents, I can see everyone's annotations. When I click on the ones I made, it shows my username.

However, when I click on other people's annotations, they say "Read Only" with a little lock symbol, but there is no username. This is a problem because it means I can't tell who made which annotations.

Is there something my group members and I are doing wrong?
Thanks!
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