A. 1. **Restart the App**: Close the app completely and reopen it. Sometimes, rewards may not show up until the app is refreshed. 2. **Check Internet Connection**: Ensure you have a stable internet connection, as rewards may not be delivered if the connection is weak or interrupted.

B. 3. **Revisit the Challenge**: Go back to the challenge section and see if the challenge is still marked as completed. Sometimes, re-triggering the challenge can prompt the reward to appear.