In an effort to increase enhanced security for our apps, we've stepped up our game and made some improvements. To benefit from these changes and continue using our apps, we kindly ask you to update to the newest version of FullContact:
FullContact for iOS and FullContact for Mac:
Open App Store → Updates → FullContact → Update
FullContact for Android:
Open Play Store → ☰ → My apps & games → Updates → FullContact → Update
You'll achieve the same by simply deleting / reinstalling FullContact.