In the CM, the T:ANE signal config file trainz-build numeral, needs to be your TS12 trainz-build numeral ... If it is a higher numeral, it won't show up in TS12
To find your TS12 trainz-build numeral, build a small route ... save ... then re-open that route in the CM ... note the route trainz-build numeral ... this numeral is what your TS12 signal config file trainz-build numeral should be ... you can try editing the numeral, and saving the asset