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1) When you create a DMZ rule and have a port forwarding rule they conflict.
2) You will want to setup two forwarding rules. One for each respective camera going to a separate port. Only one device within the home network can use a given port when routing into your router from the internet.
Let's say that you are forwarding ports 80 and 81, and you use a web browser to view this/these camera(s)
In your web browser, you did add in the port number?
And for example if your IP was 188.8.131.52, so you would enter in
to access the second camera using port 81