Use ssh to connect to the device.
Then please run the following commands (copy-paste the whole block) and paste the output here, using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have
In the CLI you can edit the config file and change only the device name from radio0 to radio1. LuCI doesn't offer this option, so the way with LuCI would be to delete and manually re-create the AP on the other radio.
The network access and firewall rules are determined by the network that the AP is attached to. So just be sure to choose the same network for the new AP. This is in a pull-down box near the bottom of the wifi setup page after you click Add.