Attempting to add second server to Multi-Node vCO

I'm running into issues adding in my next server (Orch2) into my multi-node master vCO (Orch Master). Specifically, I'm getting the following error:

Unable to create/update proxy workflows. 401 The SAML token is invalid!

I'm using SSO on Orch2 - vcenter2 provides the SSO Service. I'm attempting to run the Add a vCO Server workflow with SSO enabled, SSO server same as vCO, and not shared.

Any thoughts?