Hi @stevedennis ,
thank you for your reply. I still have some questions.
When talking about WIA are you only talking about NTLM?
What we do is using Kerberos to make sure specific AD-groups have access to our packages. Not everyone is allowed to view/download packages. Going with no authentication is not an option for us.
I can not find a documentation that states that Kerberos is discontinued. Maybe you can provide me with sources? Or maybe we are talking about different things when talking about WIA 
Right now our process is that a user is authenticated if he is in a specific AD group and wants to access nuget packages, and he needs an api key to access npm packages.
If I install ProGet 2025 with integrated web server and activate WIA in the settings, I am no longer able to make e.g. "npm i" because the authentication fails:

Which makes sense, because npm is not supporting WIA, but I was hoping ProGet manages this under the hood when switching to integrated web server.
Our ProGet instance is bound to a hostname and a port.
I already tried to explicitly disable WIA for our npm feeds, but it does not seem to be working.
Is there another setting I am missing?
Thanks,
Caterina