Battlenet Mobile App unable to Login on iOS

As the title says…i cannot login into the Battle Net Mobile app on my iPhone 12 Pro with iOS 15.6
Once i put in my credentials ,i will get the following error:

Line’s Full - We’re currently experiencing an unusually high amount of traffic. We’ll get you in when we can, so please try again later!

I have tried to login via 5G mobile connection and via my home Wi-Fi and i have the same issue.
Also via desktop over the same Wi-Fi connection i am able to connect on the web version.

Region: Asia
Country: Hong Kong

How can I log in