Velociraptor - Not acquiring memory dump / image

I have a test setup of Velociraptor.

It's simply a Linux based server and a Windows 11 client.

I can get some queries running on the client, but the built-in "Windows.Memory.Acquisition" does never finish. When I download the artefact (.zip), I get a bunch of empty files. The included log file has as a last line:

"shell: Running external command \[C:\\Program Files\\Velociraptor\\Tools\\winpmem\_mini\_x64\_rc2.exe C:\\Program Files\\Velociraptor\\Tools\\tmp3451188904.raw\]"

It seems like it doesn't even start the memdump, but I am not sure if / …

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