hey @probiquery.id.blocks! You have to do some modifications on your create react app folder. I actually have a video addressing this issue via my YouTube channel! Hope this helps! If you enjoy the content would love a like and subscribe as well (shameless plug)
You get this message because, when users authenticate, your DApp at one URL requested a resource (an identity) from another DApp, the Blockstack Browser. A request for a resource outside of the origin (your new website) is called as a cross-origin request (CORs). Getting data in this manner can be risky, so you must configure your website security to allow interactions across origins.
If you work through the Zero-to-Dapp tutorial you’ll encounter a section on how to deploy. That shows how to solve this: