The key to success For Me using Tiks mDNS implementation was provided by @victorbayas in the following post
The following Firewall filter rule was all that was needed to get my 2 isolated VLANS to work with my Apple AirPrint capable printer
/ip firewall filter add action=accept chain=input comment=“Allow mDNS” disabled=no dst-address=224.0.0.251 dst-port=5353 log-prefix=mDNS protocol=udp src-port=5353
Thank YOU @victorbayas
I did find that mDNS to be very chatty but that is expected 
