Issues with connecting eBay account
To successfully connected Shopify and eBay, you should add your eBay account to Salestio. You can find the complete and detailed instructions on how to do so by following this link
However, sometimes you might encounter various issues when adding your account. This article describes the main issues and how to resolve them.
Nothing happens after clicking the Add button on the Account page in Salestio
After you click the Add button on the Salestio new account page, you should be redirected to ebay.com to confirm Salestio permissions. In some cases, nothing happens after you click this button.
It most likely happens because of the pop-up blocker enabled in your web browser.
To resolve this issue, try enabling pop-ups in your browser. Many browsers show the indication or warning in the address line that some pop-up is blocked. Usually, you can click it and enable pop-ups just once.
If the message is not shown, you can try enabling pop-ups in your web browser and then repeat the process of adding your eBay account to Salestio.