In your filter on the customers page you are using the last day for filtering, which does not refer to the same as what is in Topology (if I am not mistaken it is in real time.
Try looking at the Appliance Status Summary.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.