If you accidentally delete Instagram from your Facebook account you may not be able to post from Instagram to Facebook. You can try these steps to re-connect Facebook and Instagram.
- Delete Facebook and Instagram from your phone.
- Go to Facebook Settings and remove Instagram permissions.
- Install Facebook and Instagram, then connect the two services.
If your photos are showing up on the Newsfeed, Facebook and Instagram are aware of the problem and working on a fix.
If friends can’t see your Instagram posts on Facebook you may need to change these Facebook Instagram permissions.
In cases where you see an error that your Instagram Photo album is full on Facebook, you can change the name of your current Instagram album on Facebook and a new one will appear when you share to Facebook again