Board Thread:Support Requests - Getting Started/@comment-45822837-20200717173633/@comment-92.255.137.33-20200717184541

If it's a brand new wiki, it uses the new platform, UCP, and you won't be able to use sitewide JavaScript on it yet. This is, however, being worked on, and there was a recent announcement there are no more issues blocking work on JS Review for UCP. Meaning, the developers can work on implementing the feature directly.