[petelanger]

To get a sound out of your pull off you have to give the string a little “pluck”. I slide my finger downwards (perpendicular to the string) while continuing to hold it against the fret and slide off flicking the string slightly. I don’t even have to use the strumming hand at all to get a sound out of the pull off.

Hoping this helps and it’s not something you’ve been told already.