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Can you please explain in more detail what changes you made?

Solved by adding the correct VLAN tag in the VM net.

I'm not sure how to interpret this. I think others who come across this post could benefit from more context being provided here. Can you also post the output of

bridge vlan show

on one of your Harvester nodes here?

Sure, the management network is VLAN Tagged at the switch level, which I was not aware. I deleted the untagged VM network and created a new one with the proper VLAN id and I could then reach my gateway