I have enabled Traffic analysis 4 days ago and have the exact same error messag "No data collected". We're around 25 people connected to the network and around 100Gb of data is going through the Firewall everyday. I can't believe no enough data is collected.
I can confirm that our dashboard is showing stats again
So if your's is still broken log a call with meraki to check
Hope you're doing well,
There was a maintenance window that took place to resolve this issue on Tuesday 17 December. The issue has been resolved let me know if there is anything else I can help you with. If not this case will be closed.
Thank you for your patience.
-- Mahad Gaal Network Support Engineer .ılı.ılı. Cisco Meraki