No access on web site with Static Outbound IP Addresses

I easaly deployed my web application and it’s very great , i like the interface.

I can access to my web application with the link [ttps://xxxxxxxxxxxxx.onrender.com]

But when i try to use One of the Static Outbound IP Addresses, i got error message “This site can’t be reached” … maybe i made a mistake
I someone can help me

Nobody know ?

What do you mean here? They are outbound IP addresses, which requests that originate the service will be ‘from’ - they are not inbound IP addresses that you can make requests to.