Sure, there are ways to workaround the problem in the browser that I ended up figuring out. But I'm still hoping there is or will eventually be a way to change the configuration on the Infoblox side so I no longer need the browser workaround.
next_available_network works on network containers. Once the parent network is converted to a network container, you have to do the call on the new container, not on the old network that no longer exists.
@FHecker I am getting an error, file not found, when I try to run your script. I've confirmed that I have all of the modules installed and that the script is executable. Can you assist with some troubleshooting? Rodney