Please restart your phone to make sure the app is working as it should.
If the ‘loading…’ notification is still present, you can follow some steps to clear it in the settings.
Go to Android Settings > Notifications > NHS COVID-19 app
Switch the Notification toggle button Off and then On again
Please note that the steps above may vary depending upon the make and model of your Android phone.
If you are still having problems, please report a technical problem.