RG-EW1200G PRO Dual-Band Gigabit Wireless Router

I have the Ruijie RG-EW1200G PRO and it cost 13500, it's Wifi 5. It also has an OPTIONAL app to restart it or to view connected devices and the bandwidth they're using. It's also dual band, it usually doesn't choke.

I am totally new at networking, but want to learn, so I bought a router that I thought I could play with. A Ruijie EG105GW-X. Reviews were good, particularly when I saw issues with Unifi hardware being discussed online, but it turns out the community around the Ruijie products seems limited and based in the east, and the interface is configured for people that know what they are doing (not me). I've created two vlans with related wifi, one being 2.4g for iot devices, and a default vlan with 5G. The printer needs 2.4G so I've put that on the iot vlan. I cannot print from the 5G vlan to the 2.4G vlan, but I can ping it from the 5G vlan. I have not created any rules, but because I can ping it, doe that mean that both vlans are open to each other? On the mac when i'm on the 5g wifi I can see the printer but System Settings is telling me that it's "in use" or that it's "offline". I can print fine when i'm in the 2.4G wifi vlan. On the router, I have tried creating "allow" rules with Access Control. With no success. Can anyone educate me on how to print from one vlan to the other? Mac with OS 26.0.1 Router: Ruijie EG105GW-X