I just wanted to add a post to the discussion regarding Rhino Inside Revit failing to obtain a license, even though Rhino 7 app launches without a problem. The solution I found to this issue follows.
After a fair amount of time troubleshooting with disabling Add ins, disabling Ironpython in Rhino 7, and making sure I had no redundant WIP installs left on my machine, I was all about ready to reinstall Revit (2020) and start over. But before I did that I recalled I had recently installed BIMTrack (this app does not have an .addin and .dll in the Addins folders). I removed this app and voila!
Once uninstalled, Rhino Inside launched without issue. Thought I’d share this with the community in case anyone else is having this issue.