After opening a new eBay account and publishing your first few products, 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.
eBay will send you an email explaining what happened and what you need to do to get your account back. You’ll also find a copy of this message in your eBay Messages.
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 and the banner should disappear after that.
More details on eBay account suspension can be found here.