Bing/Microsoft Merchant Center domain mismatch issue

Morning all,

I'm having an issue trying to launch Bing Shopping Ads due to a mismatch between the actual site domain (clientsite.com) and the SquareSpace domain destination URL (http://client-domain-123.squarespace.com). I'm not sure what I need to do to get Bing/Microsoft to recognise the correct site domain (clientsite.com) - I assume I need to change something in the site's domain settings? I've attached an image to elaborate.

Hoping someone can help me out as I'm quite new to SquareSpace and obviously don't want to implicate our client's website!

Thanks,

Alex