Thank you @DTS Engineer for the suggestions. Ye, I meant OS 18.4. I'll try out and get back to you.

Hi Ed Ford, Thanks for the reply. I tried in iPhone 15 Pro Max (iOS 16.3). I have upgraded to iOS 16.4 along with Xcode 16.3. Still no luck Note: I have iPhone 8 Plus(iOS 16.7.10 which works fine

Thank you for the detailed response.

Hi @DTS Engineer, Thank you for the suggestion. Setting up environment is working fine in both iOS versions. I'd like to see if there is similar way to pass launch arguments. As per Firebase we need to inject -FIRDebugEnabled as a launch argument. Appreciate your help in advance.