Multiple Printers configured configured via config.json in Mainsail not showing in Device Tab

[Lythinari]

Im using prind to run multiple printers on a raspberry pi.
klipper x2, moonraker x2(8101, 8201), mainsail running on 80 and Fluidd running on 81

The host(and port) is correctly set to moonraker for each of the printers
And I have the device UI address set to the same IP pointing to mainsail(IP with port 80)

In mainsail I set up a config.json file to point directly to each of the printers.

In a browser this all works fine, through the device tab I end up at the "unable to connect to moonraker"/"try again" alert

Fluidd works fine if I change the device UI address to use port 81