Facebook ShareDialog Post button is disabled

### Checklist before submitting a bug report

- [x] I've updated to the latest released version of the SDK
- [x] I've searched for existing [GitHub issues](https://github.com/facebook/facebook-ios-sdk/issues)
- [x] I've looked for existing answers on [Stack Overflow](https://facebook.stackoverflow.com), the [Facebook Developer Community Forum](https://developers.facebook.com/community/) and the [Facebook Developers Group](https://www.facebook.com/groups/fbdevelopers)
- [x] I've read the [Code of Conduct](https://github.com/facebook/facebook-ios-sdk/blob/main/CODE_OF_CONDUCT.md)
- [x] This issue is not security related and can safely be disclosed publicly on GitHub

### Xcode version

26.1.1

### Facebook iOS SDK version

18.0.2

### Dependency Manager

CocoaPods

### SDK Framework

Share

### Goals

Link is loading properly and Post to Facebook is enabled in ShareDialog

### Expected results

Link is loading properly and Post to Facebook is enabled in ShareDialog

### Actual results

Link is not loading and Post to Facebook is disabled in ShareDialog

### Steps to reproduce

1. Install and launch the app on iOS device with OS Version of 13.3/13.1/18.3
2. Login with FB through browser
3. Click on Post to facebook
4. Observe Post button is disabled

### Code samples & details

```swift
// INSERT YOUR CODE HERE
var example = "Example code"
```