I have the following meraki equipment: mt10, mt20, mr42, and MV12WE. When all productsinstalled the mt10 and mt20 automatically use MV12WE as gateway. But now I want to use MR42 as gateway. Documentation for mt10 says 'Make sure the gateway is in the same network and is online and operational. Click here for MV setup instructions and MR setup instructions.' but the MR link shows all MR documentation none of which mention anything about using MR as gateway for MT products.
It appears to be a supported configuration but how to do it is a mystery. Can someone help.
Thanks @cmr and @rymiles I was not aware of the 28.x firmware requirement. My MR and other devices were just received and installed. The MR shows MR 27.7.1, Released Jun 23, 2021. I will see about forcing an update.