Apologies, newbie to IoT networks etc. 

Just upgraded from my ISP's own router to a BE65 mesh system which I setup yesterday. 
I have a main and an IoT network, with my AirPrint enabled HP LaserJet set up on the IoT network. The printer seemed to access the internet fine as it found a firmware update and installed it. 
I've just tried to print from my iPhone via AirPrint and it cannot find the printer. 
I'm assuming it has something to do with the IoT network being called Deco IoT and the main network being called Deco Wi-Fi?
Will I need to move the printer to the main network to access it via my iPhone? Or is there another way to AirPrint from my phone on the main network and the printer on the IoT network. 
Thanks for helping :-)