That looks like message related with upgrading / downgrading license version.
As you may know, there are 2 types of license that Enterprise and Advanced Security.
If your organisation has been using Advanced Security license, and needs to use security features (AMP, IDP/IPS, Content Filtering and Geo IP based firewall in L7) on your Security Appliances (MX), renewing license by Advanced Security license would be the way.
In addition, one of point of license renewal is that you need to renew all of licenses by the license key, as Meraki license is managed by license co-termination which means all of licenses applied in your organisation end up at same time.
The following KBs would help you to understand how licensing works,
- https://documentation.meraki.com/zGeneral_Administration/Licensing/Cisco_Meraki_Licensing_Guidelines...
- https://documentation.meraki.com/zGeneral_Administration/Licensing/Cisco_Meraki_Licensing_Guidelines...
Hope this would help some!
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