@borzel thanks now all devices correctly recognized

Thanks for the XCP-ng tools.

I tried to install the XCP-ng Tools on a new Windows Server 2019 vm (german locale), XCP-ng 7.5.
I used the Windows Server 2016 default Template.

Installed Net Framework 3.5 beforehand, launched the setup.exe as administrator.
The installation finishes with the management agenet could not be started message.

I restarted the vm, no new Xen Devices are shown in device management.
Only both of these services were installed.

I ran

C:\Program Files\XCP-ng\XenTools\InstallAgent.exe DEFAULT

this installed the XCP-ng Interface Package.

I got no popup that asked to reboot the vm, but restarted anyways.

Services after reboot:

Device manager shows two new unknown XENBUS devices. Under system devices XCP-ng Interface and XCP-ng PV Bus (0002) are now listed.
Network adapter, drives etc. are same as before the driver installation.

Xen Orchestra displays that Xen Tools are not detected, but i can see Memory Usage etc.
XCP-ng Center: