Thank you for your question and reaching out. I can understand you are having query\issues related to Hyper-V Cluster VMs network.
- Microsoft's native NIC drivers for the host were probably used in the construction of the hypervisor. Replacing using your OEM's original drivers , in your case its Dell.
- Try to Disable ip v6 from VM.
- Please check Hyper-V Virtual switch settings and make sure VMs assigned to correct VLAN and Virtual switch
- In the VM Disable any Antivirus program or Windows firewall you may have for temporary purpose.
- Run Cluster validation wizard to check overall health of the Cluster.
- Update BIOS firmware and other Drivers using Dell SU.
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