CashKarma uses the device ID (IDFA) to track rewards, provide more rewarded offers, and for fraud prevention purposes. 

TO ENABLE:  Go to Settings > Privacy > Tracking and turn on Allow Apps to Request to Track 

STILL NOT WORKING?

Check if tracking is turned off for CashKarma and enable by going to Settings > Privacy > Tracking and turning on CashKarma   

IN APP ALERT

You may also see a prompt that directs you to the page to enable tracking.