What I did: Tried to create a link from one note to another.
What happened: Couldn’t; greyed out all link options. But then later I can???
What I expected: Just to be able to link, any time.
Things that might be helpful to know (Agenda version, OS and model, etc): Latest everything (No beta, on Mac, sync with iCloud). You might want to put version info in the About Agenda splash.