please make sure to call UserDefaults only after - appDidFinishLaunching. If you still see the issue and are using UserDefaults.standard, then try creating a new instance of UserDefaults with your own suitename and use that instead of standard UserDefaults.
jaspreet708
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
I also observed the same and it fixed the issue after I moved the API call to didFinishLaunching
See my above comments above. Above approach might fix your issue.