It's hard to say for sure. Maybe the format of your fanfiction was incorrect or there was a problem with the hosting. Another possibility is that there was a complaint about it and it was temporarily removed for investigation.
It could be a problem with the server. Sometimes servers go down or have maintenance issues.
Technical problems on the platform can also lead to stories being unavailable for reading. This could include glitches in the system, server problems, or issues with the database that stores the stories. Sometimes, if the story contains inappropriate or offensive content, the platform may remove it to maintain a certain standard.
Maybe the authors haven't given permission or there could be copyright issues.
Your story might be unavailable because of copyright concerns, or perhaps it didn't meet certain quality standards set by the hosting site. Another possibility is that it was accidentally removed or not properly indexed.
It could be that your story didn't meet the platform's specific guidelines or requirements. Check if there were any rules you might have overlooked.
Maybe there's a technical glitch with the app. Try restarting your device or reinstalling Instagram.
It could be that your story violated some content policies or terms of service. Review the rules to see if that's the case.
Your stories might be unavailable on some platforms because they haven't been properly indexed or categorized. Or, there could be a regional restriction in place that's preventing their availability.
It's tough to know exactly. Sometimes, it could be due to a server error, or your friend might not have completed the upload process properly. Or, perhaps there was a conflict with the terms of service of the platform where it was posted.
Maybe there's a technical glitch or error. It could be a problem with the platform or server.