Hey folks,
Thanks for all the reports! Our teams have been working on this and recently released an update for the Blizzard Desktop App that should resolve this issue. To pickup that update, please close the launcher and ensure the processes are all closed from the task manager.
Alternatively, you can try restarting your computer to ensure all the processes are fully shut down.
On restarting the Blizzard Desktop App, it should pickup the fix. If you still experience an issue after that, we can try fully removing and reinstalling the Blizzard Desktop App by following these steps.