Issue trying to get Steam Achievements working

Hi all I’m trying to add some Steam Achievements to my game but the Cache Achievement node always fails:

Relevant information:

  • Cache Achievement only fails whenever I have Steam open in the background. It says that it succeeds if I have Steam closed.
  • The Steam overlay displays correctly in the bottom right of the screen if I have Steam open, but suddenly now the Cache Achievement node fails.
  • I have tried in Standalone and Packaged builds

My DefaultEngine.ini file:

I have tried testing with both AppID 480 and my own AppID, and in both cases the Cache Achievement node does not work.

I will pay somebody to help me work through this over a video call.