Hey @RickA ,
We have had the same problem in our organization. We identified the problem on the morning of the 22nd and after troubleshooting our own network, then called Meraki.
The agent that we talked with let us know that there were other trouble calls coming in about this issue. We got some diag info to the rep and that was the end of it after we had a case opened. They did provide a work around (although it doesn't work for us as there are downstream things that rely on device enrollment) and that was to go into the network, the Systems Manager>Configure (tab)>General, then to look for the Enrollment Settings heading and unchecking the box next to Authentication.
This will cause your users not to have to enroll their device upon setup. If you need that device identified to a user, like we do, then you will need to go back to the device and assign the user manually. Not elegant, but necessary, at least for us.
I hope you have some luck.