It is obviously co-term since that one enforces the unified license tier.
On the Organization -> licensing page you will see the MX product licensing tier.
This will be set to advanced security since your other MX has that license.
You cannot mix and match MX license tiers in the same org when using co-term licensing.
So you have a few options:
- If you DON'T use SD-WAN between the sites, then create another org and claim the MX and license there and just manage 2 orgs.
- If you DO use SD-WAN between the sites then you will have to make a choice. Either return the enterprise license and get an advanced security license, OR downgrade the current advanced security license of the other MX device(s) in the org. You will however lose all IPS/IDS, AMP and content filtering options and you will not gain any license periode this way.