Have KX-td7896 wireless with kx-ta624. AutoCO hunting set. How do you pick up a call placed on hold at another extension?

You will have to park the call first then you can pick it up on any phone. the codes depend on numbering plan, look it up in user manaul

SJR, you should be able to press the CO key for the line that's on hold and answer the call.
How many CO lines and what system?
Also there is a great deal of programming for that cordless set that is within the set.
MrG

also make sure you are on the right set of buttons
there is 3 sets of 4