I knew that every device on the network needs to have a unique IP address but I believed that you have to use the same IP address that the Router assign to your device otherwise it will not work.
Anyway I tried using IP 192.168.1.200 and it didn't work too
Router won't assign an IP for your device if device doesn't ask for it (static ip is configured).
I think you should be able to use static ip for amiga. Even if DHCP is enabled on router. Give Amiga an IP address that is outside of routers IP pool (not sure if absolutely necessary), but on the same subnet. Use same subnet mask and default gateway that you mac is using so you know they are correct.
