Can Third Party SAML Authentication (Okta) be utilized for Managed EV environments?

I've been searching around, and I can easily find instructions for setting up Third Party SAML based authentication for EV.cloud, but I can't seem to find anything about a Managed Enterprise Vault Environment.  Is it not supported?

We would like to use OKTA authentication for our organization, as our we have mutiple domain trees, which in itself has caused some consternation for users.  We would Ideally like to be able to put this behind OKTA.

Anyone sure if it's possible (or even sure that it's not?)

Thanks,

-RH