VM Migration stuck at 0% VM metadata import

[Morpheus0x]

I am trying to migrate a shut down VM from Server A to Server B.
Server B is new and I deployed the XOA Instance from the Server B web ui.
I also added Server A to the XOA instance. Both servers are separate pools.
Trying to migrate in XOA doesn't work, the process is stuck at 0%:

Server B task list, VM metadata import stuck at pending:

[14:55 xcp-ng log]# xe task-list
uuid ( RO)                : <uuid>
          name-label ( RO): VM metadata import
    name-description ( RO):
              status ( RO): pending
            progress ( RO): 0.000

XCP-ng Center can migrate VM without a Problem.
There I can also see the error message for the failed XOA migration attempt(s):
Message: Migrate VM <VM-to-Migrate> Cannot contact the other host using TLS on the specified address and port; Server/Pool: Server A
Both server have public IPs, there is no firewall between the servers.

[olivierlambert]

Please check your XOA is fully up to date