Windows authentication doesn’t use Kerberos.
Windows authentication uses NTLM, if it’s backed by a directory such as an AD it’s then can be used by the server to authenticate or authorize the user.
The Kerberos support in Active Directory is somewhat there due to legacy reasons when there were a lot of directory products on the market that spoke Kerberos and it’s was added to support applications that did not shoot NTLM.
For the most part most Microsoft products don’t use it, and those which do don’t expose it to the users (SSO, tho there is now SSO with Windows principles too).
To put it more simply if you login to the server directly using a username and password (For a Windows Principle) it’s never Kerberos, for Kerberos authentication you need to go to a Kerberos server and get a TGT then use that TGT to get a service ticket for a specific resource which again is done against the Kerberos server directly that service ticket is then presented to the resource you are trying to access.