What version are you running?
Review Board 3.0.7

rbt --version

RBTools 1.0.1
What's the URL of the page containing the problem?
https://reviewboard.eng.vmware.com/r/1459522/
What steps will reproduce the problem?

crete a commit and run rbt post -g yes HEAD
when I open the link I see:

You don't have access to this review request.

This review request is private. You must be a requested reviewer, either directly or on a requested group, and have permission to access the repository in order to view this review request.

I'm not able to update existin reviews also
rbt post -r 1458947 -g yes HEAD

ERROR: Error uploading diff

You do not have permissions to modify this review request
Your review request still exists, but the diff is not attached.
https://reviewboard.eng.vmware.com/r/1458947/

It looks like a problem with the permissions, but I don't undestand why

What is the expected output? What do you see instead?

What operating system are you using? What browser?
Ubuntu 16/Chrome
Please provide any additional information below.