Oi so guys it finally started working for me!
SO uninstall all the line 6 programs (make sure they’re deleted from your bin n lollipop)... reinstall them etc etc...
BUT, and here’s the thing I think I was doing wrong, make sure your line 6 gear is plugged in to your Mac (via USB) while doing all the reinstalling. Just keep that lollipop plugged in.... after each install check your system preferences/security privacy for that little message if it hasn’t already popped up.
I find it hard to believe that I wasnt plugging my gear in beforehand but it worked finally. Let it be noted that I also just updated to Mojave. Not sure if that had any effect or not. Dunno.
Good lucky guys Fingers Crossed!