Adding Smartthings to Google Assistant?

I’ve been trying to “add” Smartthings to GA, but whenever I link my account, I’m given a message that I’m “linked” but ST does not appear in GA, much less any devices appear. What could I be doing wrong?

You have two or more locations and you are authorizing the wrong one?! Which app are you using?

I’m using the classic. I only have one location and hub.