Same here, neither QR code scanning nor manually inputing the connection code works. In my case, it worked before but I just reinstalled Windows a few days ago.
Opera Touch 1.6
Opera Stable 53.0.2907.68
Windows 8.1 64 bit
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I just reinstalled Windows and Opera and whether I try connecting by scanning QR code or manually typing code, nothing happens and I can't connect anymore. This was the last chance I was willing to give Opera to become my main browser but apparently it's full of bugs so alas, I'm going back to Chromium.
Next time don't release new versions that break the single functionality that made Opera special!