VROPS and vSphere SSO.

I have following version:
vCenter Server:                        6.0 Update1 (Build 3018523), Linux VM Appliance
vRelize Operation Manager:    6.2 (Build 3445568), VM Appliance

I added to vROPS as a "Authentication Source" of SSO (from PSC). In "Access Control" I imported group from SSO.
I tried to log into vROPS, and I use the SSO account. I get error "Failed to log in with Single Sign-On service".
Security ticket is correct. After an unsuccessful login vROPS, the I connect the "WEB Clienta" without entering user credentials.

Why am I not able to account from SSO login to vROPS?

Thank