When I rightclick (context menu) on a file or folder on my clients and I chose “Access/Restore Backups” I get to a page showing “Sorry, something went wrong or you do not have the required rights to access this file or folder.(path_browse_access_denied)”.
It works when I right click on the Icon.
On the server / settings / Server URL I have "http://[server IP]:55414
If you try to look for this server with either a domain administrator or a local administrator, can you see it?
That will answer the question on whether or not you need permissions.
Yes I am domain administrator on the server and client. And I can access a shared folder on the server where I have the client installation.
Notice that I can access the server backups from the lower right icon.