Maybe there's a technical glitch. Sometimes the app has bugs that prevent posting. Try restarting your device or reinstalling the app to see if that fixes it.
It could be that your account settings are not configured correctly. Check your privacy and sharing settings to make sure posting to stories from IGTV is allowed. Also, make sure you have the latest version of the app installed as older versions might have compatibility issues.
There could be a few reasons. Maybe your internet connection is unstable. Or it could be that Instagram is having temporary issues on their end. Try restarting the app or your device and see if that helps.
First, make sure your Instagram app is updated to the latest version. Sometimes, an old version may have bugs that prevent certain features. If that doesn't work, check your device's storage. If it's almost full, it might be affecting the app's ability to post. Clear some space and try again.
If the problem persists, contact Instagram support. Explain the situation clearly, like when the problem started and what you've already tried. They might be able to help you figure out if there's a specific issue with your account or if it's a general problem on their end.
Maybe your account doesn't have the permission to do so. Some accounts might be restricted due to various reasons like not meeting the platform's requirements or having some violations in the past.