I have looked into this further. L3 and L7 firewall rules for group policy can only be applied to MX and MR, and not MS. So it can not be done at the switch port level. https://documentation.meraki.com/MR/Group_Policies_and_Blacklisting/Creating_and_Applying_Group_Policies You should be able to do this using 802.1x and Cisco ISE, but that is a very complex setup. You should be able to do this using 802.1x and Microsoft NPS using a health policy, but that is a fairly complex setup.
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