Endless spinning wheel on master key screen
If the encryption wheel is endlessly spinning on the master key screen, it could be that you chose the “Activate device with existing Master Device” option. Once this option is chosen, the wheel starts spinning and does not stop until the Master Device (a smartphone that already has access to this account) authorizes access to the account.
If, by any chance, you mistakenly chose the option to “Activate device with existing Master Device” and are faced with the endlessly spinning wheel, you need to restart the App in order to restart the process and choose another option to access this account or log into another account. If you wish to learn more about the "Activate device with existing Master Device" process, please check the other article called "Steps to Activate device with existing Master Device".