Follow these steps
1. Close the tab where it's asking for your OTP and any other browser tabs with DocFlite
2. Open a new tab and click on the 3 dots at the top right of the browser and select "Delete Browsing Data"
3. Select the 3 available options and select Delete Data:
4. Open a fresh browser tab and go back to DocFlite. Here you can then enter your One Time Password which will have been sent to the email you log in with.

