First of all, the Canary builds are all beta releases and there's no guarantee things will work properly. I'm running regular Chrome, version 72.0.3626.119, and the Optik website works fine. Same goes for the latest Firefox Quantum, 66.0.3 (64-bit). I use my Optik TV login to log in rather than the Telus Account.
Have you tried removing Flash from your computer entirely and then re-downloading and installing it? Same for your browsers?
1) For the Note 9, only use the Optik TV app. You won't be able to access it any other way.
2) For your PC, the issue is going to be at your end. Either user error or a computer problem. If you are having problems with your PC, consider having a professional take a look at it to determine what is malfunctioning on your PC. If you are having problems with the user, those can be harder to fix.
Also ensure you are not using a VPN while trying to access Optik services. That could cause access issues as well, especially if connected to a VPN server outside Canada.