Integrate Okta iOS SDK into objective C application

I am trying to integrate Okta iOS SDK into an objective C application that I am having. I am facing an issue where the objective C module is unable to identify the classes and methods within the SDK.

In podfile, use_modular_headers! is specified, and pod ‘OktaAuth’ is added. After pod install, I am able to import the module into AppDelegate.m, but unable to call any methods of the SDK. I am trying to add equivalent objective C method for OctaAuth.resume(url, options:options) method.

Any help or insight here is appreciated