I have activated F&O but unable to add/view any scrips in watchlist

Please check if the F&O derivatives segment is activated for you. To do this, please follow the steps below

1. Click on Ctrl+E
2. Select Account and enter your Client ID (UCC)

Double click on your name and check exchanges - (NFO should be enabled) -

If yes and still not able to add scrip of F&O then clear the app data and check

To learn how to clear your app data, you can follow along with a similar problem-based article here