Users are complaining that youtube comments are blocked. I replicated. In the YouTube client, if on my meraki managed WiFi, it says Restricted Mode has hidden comments for this video. YouTube client has settings with a toggle switch for this, but it is greyed out.
If, instead, I drop off the WiFi and stay on cellular, the comments appear below the videos.
I have turned YouTube content restrictions off in Meraki.
I have even tried whitelisting the device.
Same thing happens.
Have you got "SafeSearch" or any of the YouTube for school options enabled?