I know this is an old thread but we are having this exact issue.  Were you ever able to determine a root cause? ... View more

I opened a case with Meraki on this and they stated that "it is an issue with Dashboard, but the channels should work correctly behind the scenes".  Same setup with MS425s and MS225's for access layer.   They said there would be an update at some point to fix it but sadly no ETA. ... View more

Thanks @PhilipDAth.  Hopefully they give us something we can monitor a little more proactively in the future. I have a case open specifically addressing the "no ports in use" showing under the port's "aggregation group".  I will let you know if I get a different response. ... View more

I am having the same problem when connecting to a switch stack.  Any word back from support on this? ... View more