It might be due to the platform's rules or a bug. Some platforms have specific rules about sharing others' stories. If it's not a rule issue, try logging out and logging back in. This can sometimes refresh the permissions and settings. If that doesn't work, contact the platform's support team. They can look into whether there's an issue with your account specifically or if it's a wider problem with the system.
There could be several reasons. Maybe your friend's account has some restrictions, or there could be a compatibility problem between your accounts. It's worth double-checking the platform's rules and guidelines.
There could be several reasons. Maybe there are some technical glitches in the app or platform you are using. Check if there are any error messages. Also, it might be due to restrictions in your account settings. For example, if your account is not fully verified, some features like adding a story could be limited.