If you're experiencing technical issues with Tubi on your Android mobile device, please follow the troubleshooting steps below: ... Restart the app by exiting out, closing the background app and re-opening Tubi. Restart your device and re-open Tubi. Uninstall Tubi and re-download it from the Google Play Store.
To know about Tubi.tv/activate code problem - https://www.channelactivation.net/tubi-tv-activate/