The first time you sign in to Call Control, you will be prompted to give the app permission to send you notifications. Click “Allow Permissions” on this screen to allow Call Control to send you notifications. If you clicked “skip”, you can allow permissions at a later time by clicking “Allow” the next time you open the app and you receive a prompt to do so:

If you do not receive a prompt to allow Call Control to access your contacts, navigate to your phone’s settings. Find and tap the “Call Control” icon. Then tap Notifications and slide the bar to the right to allow notifications.