we have a fresh installed Veeam B&R Enterprise Server (Version 11.0.0.837_20210525) on a new hardware and want also install VeeamOne (Version 11.0.0.1379_20210419) on the same machine (Windows Server 2019). The installation runs without of any problems, also the connection the SQL server works fine, but when I want to add a server to the infrastructure it failed when I select the local server, tried it with "localhost", "DNS-Name" and "IP-Address" (some funny fact: VeeamOne can't work with IPv6 Adresses

Error Message is:

I already have try it, while the Firewall is turned off, no luck with it. We already have reinstalled both programms (B&R and VeeamOne) with no luck.
Is there any known issue?