No prompt for DUO after installation

I have 3 servers Windows Server 2019 which have the DUO installation completed locally and in the DUO Console but I do not get prompted for the DUO authentication?
Any idea?

Hi Dominique, Welcome to the Duo community!
I recommend reaching out to Duo Support to create a ticket for troubleshooting this.
Please also review the following article and be sure to provide the requested details with your ticket to speed up resolution.