Log in your router by ethernet cable if you can't via wi-fi. Go to basic wireless settings and check 'Enable SSID'. Then your network should be visible.

You can file your idea under Archer AX3000 model. It should be pretty much the same.

A lot of users would like to have the ability to disable OneMesh feature, thus stop broadcasting hidden networks that are visible even if the device is in AP mode (OneMesh not supported). This...

The feature request is defined/visualized in the first post and justified in my last post of this thread.

Yeah, I know the old models have the port settings. Can't help with the AX50 option missing in drop-down list. Maybe if you open a new thread as a feature request would be OK.

If you can't use plain SMTP service on port 25, then yes. Have you checked the router manual (regarding this setting) to see if I am missing something here ?