OK, I was able to validate it for the new site.
Sorry to resurrect this, but it's not working again. I get message to revoke and reissue, but I don't know how to do this.
I followed the instructions on re-assigning in your "Product Validation" link, but I keep getting the same message.
OK, again, after repeated efforts, finally it worked, but I have no idea what I did right. Frustrating.