The Meraki dashboard has NEVER shown devices or OS's accurately.
 
Meraki APs identify clients using a technique called OS fingerprinting. Each OS, and sometimes version of an OS, has a unique DHCP fingerprint. By examining a client’s DHCP request, we can tell which OS it is running.
					
				
			
			
				
	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.