MSAL, Authenticator, Passwordless

Question

I am looking for a sample that implements Passwordless Authentication from a windows desktop app. I have a user id and somehow want Authenticator to popup on there phone, They can enter the magic number and I get an auth token. This flow is documented in this article

https://learn.microsoft.com/en-us/entra/identity/authentication/concept-authentication-passwordless

I have found no information on creating an app that leverages it. I am familiar with the MSAL device code flow. It seems similar, but there is no way I can find to initiate for a UserId and so it does not use the Authenticator.