As previously stated set up a syslog server to view live traffic - kiwi syslog do a free trial license for 30 days.
or, just flick the allow all any any to deny and see what breaks
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.