The window titled “Certificate Authentication” is not shown while creating a vSphere 6.7 hypervisor host connection with XenDesktop.
The issue is caused by new changes in vSphere 6.7
This issue is fixed in Virtual Apps & Desktops (XenApp/XenDesktop) 7 1811 and 7.15 LTSR CU3.
Users on Virtual Apps & Desktops (XenApp/XenDesktop) 7.18 & 1808:
Administrators can push the vCenter server certificate manually to the Delivery Controller server by following steps outlined on https://support.citrix.com/article/CTX138640.