Amazon Connect Outbound campaign - The status sticks to Created

I have created an Outbound Campaign but its status remains at "Created". Why? I try to do this procedure, but I can't. I'm guessing it has to do with the fact that this status seems to be stuck. https://aws.amazon.com/fr/blogs/contact-center/make-predictive-and-progressive-calls-using-amazon-connect-high-volume-outbound-communications/

thanks