Hi, I have the same problem with 2 Meraki Go 24 Port POE Network Switches.
PoEs were running fine until yesterday, but suddenly stopped working. No error message in the dashboard.
I reported the problem to Meraki support and was asked to perform a factory reset. (Info reset button is located at front, lower left corner).
I did that, howerver the problem still exists. PoE does not work, so i can not use my PoE requiring access points in the building.