I tried the emergency reset option on Opera Sidebar's Flow, but it still did not work on my end..
While frustratingly looking for a way to connect my phone to my computer's flow, I have noticed, that after you scan the QR code and redirected to the login page, your phone and computer is already connected.
If you click on the "X" to close the confirmation code(on the phone) it will disconnect that connection. So what I have done is; I closed the Opera on my phone, then opened it again, and voila, I'm connected!! 