Hi there,
This can happen when you have IPv6 turned on. IPv4 connects but for whatever reason IPv6 doesn't show as connected and you get the warning. Most of the time a reboot solves it, or you can reset the adapter in Powershell:
restart-netadapter "adaptername"
Here is a thread as well that discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
No network access for one VM (6 running fine). Hyper-V
https://learn.microsoft.com/en-us/answers/questions/538132/no-network-access-for-one-vm-6-running-fine-hyper.html
--------------------------------------------------------------------------------------------------------------------
--If the reply is helpful, please Upvote and Accept it as an ant