Shopify says that my email address isn't linked to any paypal account

[Callyz]

Hi, I have a store through Shopify.  I am trying to link this to my ebay account, to which I had to set up a paypal account.  I have set all 3 sites up (ebay, shopify & paypal).  I click to upload products from shopify only to get a message saying - 

All sites are using the same email address.....

Please help