Task “Not credited”: why

“Not credited” means the ad network did not confirm the action. The reason is shown on the task screen.

Common reasons

You came back too fast. A visit shorter than 3 seconds does not count. Tap “Visit the ad again”, do the action and only then come back.
The network did not confirm within a minute. Tap “Check again” or visit the ad again.
This campaign is already paid. One campaign, one reward.
Today’s limit is used up. New tries start at midnight.
Too soon after the previous task. Wait for the pause to end.
The reward is under manual review. No need to repeat.
Purple closed during the visit. The confirmation did not arrive: repeat and come back without closing Purple.

VPNs, emulators, repeated clicks or several accounts do not help: such actions are not credited.