Hello Vishal Khakhkhar,
Welcome to the Microsoft Q&A and thank you for posting your questions here.
According to the reference documentation you pointed to:
Check through, this is an official documentation. Kindly use latest version of the ACS iOS SDK that is a stable release the feature is for a stable release and if you are still facing issues, double-check your implementation and the SDK version you are using.
I hope this is helpful! Do not hesitate to let me know if you have any other questions.
Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful.