We were having a discussion yesterday about this in another topic. I suppose one of the ports is connected to a switch and the other to the printer? We're not sure it's supported without having support change some settings. But it might be.
Can you check the following setting in Network/General, if it's set to Have no access, change it and have them appear connected to the SSID of your choice:
See here for the other discussion:
https://community.meraki.com/t5/Wireless-LAN/MR52-and-MR53-ports/td-p/36123/jump-to/first-unread-mes...