3rd party VSTs not recognizing midi CC from knobs on nanoKONTROL2

I’m using the nanoKONTROL2 with ableton 12.  Default midi CC sent from the control knobs is not recognized by 3rd party VSTs so I cannot assign the knobs to anything inside VSTs.  Can assign the knobs to other ableton functions like sends, pan etc but not within VSTs.