Replaced fluorescent tubes with LED tubes, the LEDs only turn on when tapped
I have the same issue.  The Keystone KTEB-232RIS-1-TP-SL ballast is not compatible with the Feit T48/840/LED/2 tube.  I have four Lithonia Lighting fixtures I just purchased only to learn the Keystone ballast is not compatible with these Feit lamps.  I've had good luck with Feit products.  This is a compatibility issue.