Yes the Meraki is the default gateway in this case.
That was also my understanding and the FTP active directory group that I am trying to map is a user group only (for testing purposes I tried to add the computer object there as well), but the goal clearly is to manage a group policy ruleset for an active directory user group only (FTP users). I hope this clarifies the situation.
I am pretty sure the Active Directory integration works fine as far as I understand. Because when I go click on the Client machine I can see an Active Directory user:
Do I assume correctly that with this sitatution, the group policy's firewall rules should override the default L3 rules for any user in the Active Directory FTP group?
Concerning your comment about the AD auditing, I checked the domain controller's applied settings by running rsop:
Success is in place for both sections.
Am I missing something else?
Thanks a lot for your help.
Regards,
stockster