Only customers in PRC region facing flashback

We have a Xamarin cross-platform app which is distributed worldwide via apple Store. Only the customers from PRC(Mainland China) region are facing flashback issue after installing the app from the Apple Store.

Being in India we are unable to replicate the issue even after changing the ITunes region to Mainland China.

Any insights into why the flashback issue is geo specific and how we can replicate the issue from India?