My Noesis UI not working What Did I do Wrong?

It looks like the data context is right. Make sure you have the horizon/social API toggles on in the API section of the Script Settings. On line 37 you are setting player to the server player not a real player. Try this.entity.owner.get()

All API are on and 

 /**

   * Handles the actual logic to open the invite panel.

   */

  private openInvitePanel() {

    const player = this.entity.owner.get();

sill doesn't work

Try it in preview mode. I don't believe that panel works in the editor.

This could be a bug. I was unable to open it the other day. Make a bug report.