Hello !
A try to allow guest user on my wiki to post a review on my page, but impossible… In my right I have :
For an user that work :
But for a guest :
Do you know the problem ? 
Thank you !
Hello, I’ve just tested on XWiki 15.10.8 and it worked fine:
And after clicking “Add comment”, I get to see the comments:
What version are you on?
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Hello,
thank you for your answer. I have the version 16.2.0 
thank you !
I’ve tested on 16.3.0 and it worked fine there too (the UI is slightly different).