If you click on the PK4 TimeTracker oAuth tile from the App Launcher, you will see a Thank You page like in the image below.


Unlike other apps, TimeTracker uses the tile to get the oAuth privileges for using the PK4 TimeTracker application in Salesforce.


You only need to click on the tile once, when you initially install the PK4 TimeTracker app in your org. If you click the PK4 TimeTracker oAuth tile again, the TimeTracker app just gets re-authorized and nothing else happens and the PK4 TimeTracker app continues to work as usual.