I think what you're saying is that I need to sign up separately for Square Online, but that's what I'm trying to say: I have a Square Online paid subscription and the website is fully operative, so it's not seeing my existing shop.  I've been 'escalated to SA support' so I guess we'll see if they have any suggestions.

Hi Megan,

Sorry, let me clarify - your Square Online is one thing. Your TikTok account is another thing.  And the part that you're hitting where it's asking you to "Sign Up" is a totally separate THIRD thing. I know it seems completely wrong, but trust me - hit sign up and go through the steps.  I had to do the same thing.

I start in the Square Online dashboard, click sales channels>tiktok for business and then I'm routed to regular Square dashboard where I click Go to Online Sales Channels, then Connect for Tiktok, go through the permissions and get this screen.  If I click Set Up Online Store, it takes me back to the Square Online dashboard where I can repeat the whole cycle again.

That sounds like a different loop than what I was stuck in. Hopefully the Square team here can help!