At&t samsung galaxy s7 edge to verizon
Just paid of my at&t samsung galaxy s7 edge and requested to have it unlocked.I got the email with unlock code and went to verizon and they put in their SIM card and entered code and it said phone has been successful unlocked. But the phone will not work and when they enter my IME NUMBER in their system it says device not in data base. I can not find anyone that can tell me what' going on. Why can't I use my at&t phone on verizon if it's unlocked?