Fidelity ADT also outlines some of the safeguards and internal processes they untilize around digipad codes and more in their communication below. They also outline a few best practices for customers to follow, as well as outlining a way forward.
"Fidelity ADT advises customers to regularly change their digipad access codes, especially after a response to their properties. These codes can be changed at any time. Please remember to update the codes with Fidelity ADT when changed."