Xen failing after add server

I thought I was making progress following Tom’s latest xcp videos, but run in to a problem after I created the xen appliance and try to connect servers.

I installed xcp-ng on 2 physical machine .69 (beta 8.3) and .71 (8.2)
I installed xen on .70 using the cli as described and it worked. logged in to xen and added the server .70 and tried to add one that was created on .72

Both say they connect, then display the red triangle and give the same error as displayed in the screenshot