Quick update - we downgraded the MRs to 16.9 (which is what we were running prior to the issue), but it didn't help.  We then downgraded the MSs to 16.9 and we are back in business - bonjour printers showing up as normal. ... View more

Are the AppleTV's on the same subnet as the device connecting to it?  If not have you enabled bonjour forwarding? It's located under Wireless>Access control     I have AppleTV's that are on a Misc subnet that are accessed via devices on two different subnets and they work without any issues.  ... View more