Windows Authentication and APIKey

A REST request endpoint needs both windows user authentication and APIKEY token (one per environment). I have set username and password as Basic in authorization section (tried with  and also without domain) and added APIKEY value as a Header parameter. I am getting 404 - File or directory not found.

Need your help on setting up authentication and authorization. Please let me know if anyone has idea on this. Thanks.

FYI - Set project preferences as in the below screenshot:

 I am still looking for help/guidance on this.

I have tried using NTLM authentication settings instead of Basic as the implementation is by using SecurityProtocolType.Tls12 and defaultNetworkCredentials

Followed steps listed at: https://www.soapui.org/oauth2/reference/ntlm.html

thank you.