Please note: Feb 13, 2020 to Feb 18, 2020 our company is spending vacation holiday . Because of this, you may get some delay on our reply until Feb 19,2020. In the vacation time, we may take 48 hour instead of 24hour to reply.
If you see this "This key is already used in another site. contact support team" then your key has been used in another domain. You have to remove the key from that domain first. See the image.