These instructions show how to add an installed video doorbell to the customer App, when a WIFI connection needs to be made. 
Go to this link for instructions and a demo video:

https://answers.alarm.com/PC/Property_Management_Support/Video/Alarm.com_Video_Doorbell_(ADC-VDB750)_Resident_Guide

  1. To verify your doorbell is ready to connect to Wi-Fi, press and hold the doorbell button for 45 seconds. Release when the LED light starts blinking red and green. Then, wait a few moments until the LED begins blinking white. This indicates the doorbell is ready to enroll. If the doorbell does not blink white, please contact your property manager for assistance. 
  2. Open the PointCentral app.
  3. Tap Doorbell Camera.
  4. Tap Add Doorbell Camera.
  5. Tap to select ADC-VDB750.
  6. Verify the LED Light on the doorbell is flashing white, then tap Next.
  7. Add a preferred device name (e.g., Unit 102 Doorbell).
  8. Connect to the camera's Wi-Fi network. The network name format will be ADC-VDB750 (XX:YY:ZZ) where XX:YY:ZZ is the last 6 characters of the camera's MAC address. The camera's MAC address will be provided to you by your property manager. 
  9. The doorbell should begin Installing. This may take a few minutes.
  10. Once installation is completed, the Video Doorbell is enrolled. Use the PointCentral app to select the chime type.
    1. Tap Doorbell Camera
    2. Tap 
    3. Using the Chime Type dropdown menu, tap to select the appropriate chime type. 
    4. Tap  "check"