When you install the new Global Tasks mobile app onto your Samsung mobile device, you may run in to an issue where once you have signed in, you won't be returned to the Global Tasks app.
To make sure that Global Tasks works correctly, once you have signed in to your Global Tasks account, if you have not been sent back to the Global Tasks app, please click on the Global Task icon on the top bar:
Alternatively, you can open the Samsung mobile browser and then select Settings>Useful features.
In here, you can toggle on the option to 'Open links in other apps'