You are right about the grace period, you have 30 days left. For the license ... no, it is not valid for a vMX because it is for the ... MX100. That leads to the question why you ordered it if you don't have one? By mistake? If the licenses is new, you can let it refund. About applying the licenses ... I wonder why you got three licenses. To extend the license duration of the organisation, you need to apply one license with all what is needed in one license. But if you have your dashboard license expired anyhow, you could add the first license with "Renew my Dashboard license" which resets the inventory devices to the device of the first license. After that you add the other licenses with "License more devices" and you are all good. And for you next renewal interval, come back and ask how to handle all of this before ordering the licenses. Happy Holidays!
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