On iOS 14 or lower, I'm able to launch Google Authenticator app by deep link as the code below:
UIApplication.sharedApplication().openURL(NSURL(string: "otpauth://")!)
However, it does not work on iOS 15 anymore. It seems iOS 15 does not allow to trigger Google Authenticator app by deep link. I also tried on my phone browser with "otpauth://". It's only able to open the app with iOS 14. Can anyone help me about this issue? Thank you.