This problem can be caused by a privacy setting on iPhones.

  1. Go to Settings > Screen Time > Content & Privacy Restrictions

  2. If Privacy Restrictions are turned on, make sure that "Contacts" is set to allow.

  3. If "Contacts" is already set to allow, try turning off Content & Privacy Restrictions and see if the problems still occur.

  4. If the problem still occurs, delete TappTracker and reinstall. by going to Settings > General > iPhone Storage > TappTracker > Delete App.

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