Tell us what you are trying to do?
-- I have created the new key to use on the site but it is not working on site.
Is there any documentation that you are following?
-- Yes I have followed the documentation while doing setup the key.
Is there a similar example that we can see?
-- No
What is the link to your site? hidden link
It seems you may have copied and pasted the site URL in order to generate the key. In your screenshot you will see a Get a Key for this site link.
If you click on this link it will send the exact website link to our system to be registered. Please try generating the site key with this and let me know if the problem still remains.