Hi @SenhorDolas ,
as you run the command inside of the VM on OS-level there will be no reservation created in Azure DHCP.
Here are 2 links which might be helpful:
https://clusteringformeremortals.com/2018/09/21/step-by-step-configuring-a-file-server-cluster-in-azure-that-spans-availability-zones/
https://techcommunity.microsoft.com/t5/itops-talk-blog/creating-a-traditional-windows-server-failover-cluster-in-azure/ba-p/1564548
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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten