mod_auth_mellon is not working under </Directory> with DAV on

[eselvam]

we are integrating mod_auth_mellon in apache under with DAV on. when we try to access the DAV we are getting "You don't have permission to access the resources" The saml auth is completed successfully then it try to allow DAV access it is not working.

Config is:

DAV on
AuthType: Mellon
MellonEnable: auth
Require valid-user

If we use without Dav on it is working fine and listing files, once the Dav is on it is not working. Kindly help.