After opening a new eBay account and posting your first few listings, it is quite common to receive an account suspension. eBay says it restricts or suspends accounts as a safety measure to protect their community against fraud or any other negative impact. They do this so that you can verify who you are in person.
eBay will send you an email to your registered eBay account email address and to your eBay messages explaining why this has happened. They will also let you know what you need to do so that it can be reinstated.
Once the eBay account has been reactivated, click on the "Refresh" button in Printify:
If you're sure that the eBay account is no longer suspended and yet the banner doesn't disappear upon clicking the "Refresh" button, please proceed to clear your browser cache and cookies. The banner should disappear after that.
More details on eBay account suspension.