We have had a couple devices we are not able to make work with Meraki switches (MS350-24X).  One is a Sensaphone Web600 environmental sensor, and the other, a Crestron re-branded Dell Windows-based appliance for a Zoom Room. We have not dug too deeply into the issue, beyond the obvious GUI settings (speed/ duplex, access/ trunk, et al), but have not had any success. For the sensor, we have left it on the old switch, cascaded to a Meraki. A bit of a waste, there.  The Zoom Room appliance we made to work with the Meraki switch using a USB Ethernet adapter... only the built-in adapter is not compatible.  Of course, the built-in Ethernet port does work with our Catalyst 9400 switches. There may be some other settings on the Windows appliance we can toy with once credentials are handed down by the installers, yet out of the box - not compatible.  ... View more