Hi,
May I know what type of virtual switch you have connected to the VM Hyper-V Server 2019?
If it is a private virtual switch, the VM will not be able to communicate with the host.
Create a virtual switch for Hyper-V virtual machines
Also, please check if you have enabled "Integration Services" from Hyper V manager.
Hyper-V Integration Services
Manage Hyper-V Integration Services
Thanks,
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