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You dont need a license for inventory items.
But if you want to start using it:
If your using pdl then you need a mx85 license.
In co term you can contact support to convert the license mx84->mx85 https://documentation.meraki.com/General_Administration/Licensing/Meraki_Co-Termination_Licensing_Ov...
If you are happy to cold swap them then you don't need it as you can convert the MX84 one. You get a 30-day grace period to fix licencing when it is out of compliance.
Please forgive me for confirming many times.
Add brand-new equipment, you can also have a 30 day grace period, is that right?
But if an MX series security appliance was added to the same organization, it would enter the 30-day grace period because the organization is not licensed for MX security appliances. For more information about the 30-day grace period, read the License Limit and Current Device Count section of this article or refer to the License Info article.
@Kiki the device can be in the organisation inventory, but not in a network. In other words were the MX84 to fail, you would have to set up the MX85 before traffic were restored.