Spoilers in link.

After spending way too long trying to press a button that doesn't do anything (press button, depress button, push button, button, press the button) or trying to talk to the speaker (say open, talk to speaker, talk at speaker, shout at speaker) I got frustrated and used claude to give me a walkthrough based on the source code.

Turns out the correct command was "hi"

here's the walkthrough: https://pastebin.com/LHnFRFjw

Derp. Thanks. I was exactly stuck at the freaking button right now and not finding any help online. Yet :D