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  • Angelie Soto thinks this is interesting:

After a VM is deployed into a VNet, it cannot be moved to another VNet (without deleting it and re-creating), so it is important to consider carefully which VNet the VM should be deployed to during creation

From

Cover of Exam Ref 70-533 Implementing Microsoft Azure Infrastructure Solutions

Note

That's correct. VMs can not be move to another Vnet once they've been associated with it.