The "Invalid or missing state" error in Turnitin is caused by browser security settings blocking third-party cookies preventing the assignment from loading correctly.
To resolve this, enable third-party cookies and JavaScript in your browser's privacy and security settings.
How to Enable Third-Party Cookies:
- Chrome: Go to Settings > Privacy and Security > Site Settings > Cookies and site data > Allow all cookies.
- Firefox: Go to Settings > Privacy & Security > Cookies and Site Data > Allow all cookies.
- Safari: Go to Preferences > Privacy > Allow cookies from current website.
- Edge: Go to Settings > Cookies and site permissions > Cookies and site data > Allow.
Please fully shut down and restart your browser for the changes to take effect.