Hi at all,
I could solve this.
There seems to be a DNS problem between the View connection server and the Replica server.
If I logged in to the View Administrator on the replica server, I could see other desktop and pool entities, than I logged in directly to the first connection server.
So the communication between both connection servers was not correct.
So I uninstalled the replica server, than I re-installed this server instance.
Now the communication between the connection servers seems to be fine and correct.
And now I can create new desktop pools without any problems!
Kind regards and have a nice weekend,
Andre