Hi @Tim_Reckling ,
Could you provide more information? Here is a good link for HA on VM-Series -> https://docs.paloaltonetworks.com/vm-series/9-1/vm-series-deployment/about-the-vm-series-firewall/vm-series-in-high-availability. For example, the original HA document for Azure does not use virtual MACs. However, the Azure deployment guide https://www.paloaltonetworks.com/resources/reference-architectures/azure recommends using the Azure Load Balancer with 2 independent NGFWs for faster failover, in which case the virtual MAC is not required.
PANW has reference architectures for AWS, GCP, etc. https://www.paloaltonetworks.com.au/resources/reference-architectures
So, there may be some good documents for your virtualization platform to help solve your issue.
With regard to normal HA configuration, you must use the virtual MAC address.
Thanks,
Tom
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