We're having the same issue. Trying to add a virtual app to Horizon using a SaaS based instance. Says there are no connectors. We're able to connect Horizon (on-prem) to our SaaS based instance using the SAML authentication setting with no issue. Status is "green" from Horizon's point of view. When we try to add the Horizon View On-Premises type, Sync Connectors are empty, and if we click Add Connector it does nothing.
Is this a bug in this latest release?