Can't open the klarna's authorize popup in reactnative app for ios.

[sansui-orz]

Describe the bug
After I authorize braintree 's 3D Secure 2, i can't open the klarna's authorize popup in reactnative app for ios.
I find KlarnaPaymentView's authorize method and callback was be called, code execution is normal，but I can't see the authorize popup.

To Reproduce
Steps to reproduce the behavior:

1. get a reactnative app for ios
2. 3ds authorization and payment by braintree sdk
3. create a new order, and use klarna payment

Expected behavior
how to fix it, or tell me what happend

Device and version:

• Device: [e.g. iPhoneX]
• OS: [e.g. iOSq5.4.1]
• SDK Version: 2.0.18

Impact Level
Is it a blocking issue for development.