Delete Fields Good Chicken LevelUp app and download the new Fields Good Chicken Fielder’s app from the App Store or Google Play Store.
On the Sign In screen tap "Migrate My Rewards" and fill in your account details. Your email address must match the one you've previously used with FGC.
When prompted, tap “Send Code” and a verification code will be sent to you via email. (Check all your folders!)
Enter the code on the Verify Email screen and tap “Submit”.