A couple of issues. They maybe related or separate issues
1. Facebook login not working. It might be due to Facebook data usage verification. i completed that and login is working on android but doesnt seem to be working on iOS. It might just be a configuration issue.
2. home screen and another screen is not loading on iphone XR. It works fine on other devices tested. This might be some device specific issue. It is probably not related to the facebook issue as it happens with regular login (not using FB login).
I am looking for a developer I can work with on an ongoing basis. I have plans to do bigger projects so I need a good, reliable iOS developer.