unable to build Unreal Engine 5 from source (release branch)

Hey there,

I eagerly followed all of the instructions here and here for trying to build UE5 from source. No matter what, I always get that error:

Microsoft.MakeFile.targets(44, 5): [MSB3073] Der Befehl “…..\Build\BatchFiles\Build.bat Unsync Win64 Development -WaitMutex -FromMsBuild” wurde mit dem Code 6 beendet.

Same issue, with 5.2. Downloaded by tags/5.2.0-release