If a VIP administrator is a member of a VIP Administrator group where Allow Direct Sign-in is set to Yes (enabled), that administrator is prevented from singing in the VIP Manager directly (vip.symantec.com) and must use the organization's sign-in flow to access. This is most often through single sign-on, VIP Enterprise Gateway IdP, Active Directory, or other deployed authentication solutions.
The administrator must access VIP Manager through the organization's access point or valid IP address range if it is restricted by policy (single sign-on, VIP Enterprise Gateway IdP, Active Directory, or other deployed authentication solutions).