BENQ RL2455 Out of Range on Macbook Pro

Change your display resolution

1. From the Apple menu, choose System Preferences.
2. Click the Displays icon.
3. Click Default for display. If you see more than one resolution listed, choose a resolution and refresh rate. If the display turns off when you change resolutions, press the escape key to undo the change.
   

If you can't change the resolution of your display because you can't see an image, restart your Mac in safe mode to reset the display resolution to defaults.

If starting in safe mode doesn't resolve the issue, reset your Mac's NVRAM and SMC to reset the video ports on your Mac to their defaults.

Check for third-party display software

If your display works only when your Mac is started in safe mode, and you have display-related software installed, check with the software's developer for updates, or try temporarily uninstalling it.

Be sure to tun off [√] Mirror Displays.

This setting forces both Internal and external display to a common resolution, which sometimes is not close enough to a supported resolution, and the external display drops out.

That looks like it should be a perfectly appropriate cable for this application.

The fact that your Mac knows the external display is there, and that it knows the display's name and capabilities (you never typed in the name of the display, yet the heading in displays preferences pane shows the display name) indicates that the secondary data channel is working, and the display is responding to the Mac's query, "who are you and what are your capabilities?".

So if both ends of the cable are fully seated, the next most likely possibility is your cable (or possibly one of the ports) has a sample defect, that is, this particular sample (out of all those made) is defective.

To make further progress, I think you would need some known-good parts to substitute, then see whether the problem follows the computer port, the cable, or the display.

I'm using a usb-c cable for HDMI.

exactly what cable is that?