You already have a web property in Google Search Console. Now you try to link Google Analytics with that. But you are getting error “You haven’t verified any sites.”. Most likely the problem is that you have created a Domain Property in Google Search Console. And that is not currently supported to link to Google Analytics. You need to create a URL prefix property for your website & then link it to Analytics. You can keep existing Domain property as it is. There is no harm & you might use the extra data from Domain property in future. But if you want to clean up, you can check this post on how to delete a property from Search Console.