NTLM (negotiate) auth stopped working on Safari

Hi,

Recently (about month ago) I was notified by some of the users of my web application that NTLM authentication stopped working on safari. When the user is reaching out to the application is getting prompted for credentials and once provided the prompt is getting back. After weeks of investigation I have no further clue what can I check and do on the endpoint to make it work. As a workaround the kinit is working so the Kerberos Authentication works. Also on the other browser (like chrome, brave) the NTLM authentication works also - once prompted users are getting into app.

The mac os version 14.4.1 and safari browser 17.4.1.