In the Horizon Console dashboard, you can configure VMware Horizon to trust a vCenter Server certificate that is untrusted.
VMware strongly recommends that you configure vCenter Server to use TLS certificates that are signed by a CA. Alternatively, you can accept the thumbprint of the default certificate for vCenter Server.
Similarly, VMware recommends that you configure SAML 2.0 authenticators to use TLS certificates that are signed by a CA. Alternatively, in the Horizon Console dashboard you can configure VMware Horizon to trust an untrusted SAML 2.0 server certificate by accepting the thumbprint of the default certificate.