OK, let's start from scratch, in a way I suppose.
I think I helped in your discovery of scanning from the "Printers and Scanners" dialogue, so I think I deserve credit for that.
However, you can't scan from the scanner itself - even if there was not a computer involved at all, please confirm this?
When you attempt to scan from the scanner, no computer involved at all, the scanner says "Failed to connect to the device MTW005" - could you also confirm this?
If there is no computer involved, then what "device" is it failing to connect to?
Logic tells me that it's trying to connect to the computer - so we're back to the computer.
Does that make sense?
Because "scanning" from the printer ... to what?
If you're simply trying to "scan" to another piece of media (paper, photo stock, etc...) in the printer, well that's "copying" not "scanning".
Am I making any sense at all?
So, now we're back to scanning to the computer, because you wouldn't scan to another piece of paper. Scanning is to get a digital image of something, and the digital image must be saved somewhere, usually a computer.
Do you now see why it wasn't really a misunderstanding on my part at all?
And now you can scan to the computer, through the "Printers and Scanners" dialogue, so you are able to scan.
I really don't think there is an issue, unless I am somehow still missing something?