You don't see the text when you log in to the PK4 TimeTracker application on the device is because you might have enabled the dark mode on your device. Please disable the dark mode and enable the light mode on your device.
We suggest you disable the dark mode on your device is because all the font-related to the PK4 TimeTracker application is in black (dark mode). If you disable the dark mode and enable the light mode on the device, the text related to the PK4 TimeTracker application shows up on the device. And this will fix the issue.