I have an S21 and an Under Armour branded Samsung Active Watch, and the apps do not talk to each other. I have uninstalled and reinstalled multiple times on both devices, reset both to factory settings, and yet I am still not able to open the app on my watch. I receive the message to install on my phone, which I have. Unable to email customer support from the app, as it hangs. 3mths have past since I first posted and still no fix, Ticket raised multiple times. Please read before responding!