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Help - can't publish to staging site?

Hello! I am working on a client e-commerce site and am almost complete. I just created a Webflow account for them and transferred the site to their (free) account. I am encountering an error where it won’t allow me to publish to the webflow staging site. It says to either verify your email address (which we did) or add a hosting plan.

Can anyone help me clear this and publish the site to the testing URL please?
Is it because it was previously published to that URL from a different account?

Screen Shot 2020-09-01 at 9.05.25 PM

Here is my site Read-Only: [][1]