Hello!
Sorry to hear you're experiencing this issue and thank you for your patience. Given that Android is working properly, the issue is likely to do with your settings for iOS, which we unfortunately cannot advise on.
To troubleshoot, I recommend manually passing the `client_secret` as "client_secret" rather than "clientSecret" in Postman. If this works, it tells us that "clientSecret" in your config is not being transformed into "client_secret" for the request. You may also find it helpful, for further debugging, to confirm the requests via Charles Proxy.
Best,
Natalie