It seems as though the APU (626-815-6000) number was categorized as Spam in Dialpad. Please go to the Spam tab on Dialpad and click on the arrow pointing down to mark this as "not spam"! This seems to resolve the issue!
Please refer to the picture below!
If you have any further questions, feel free to call the Support Center at (626) 815-5050 or email us at firstname.lastname@example.org!