We see an Error "An error occurred while fetching identity providers. Please try again later. If problem persists, contact your administrator" while accessing the vCenter 9.0 UI with VCF SSO login authentication.
The VCF SSO authentication works with other Integrated components
VCF Operations 9.x with VCF SSO (Embedded)
vCenter 9.0
The VMware Trust Management service, which is responsible for handling authentication and security mechanisms, was found to be in a stopped state.
Manually start the VMware Trust Management service via the VAMI interface.
Verify if the VCF SSO Login works from the vCenter UI.