Turnitin has informed us that the following should fix this error. If the error still persists please log a call with help4u with FAO CTIL in the title.
The error message “Sorry, we could not process your request. Invalid or missing state” can usually be resolved by editing your browser’s enabled Privacy & Security preferences so that it will not block any background scripts that Turnitin is trying to load.
Please try following the steps below to ensure that the preferred browser reflects the correct preferences:
In Firefox, select File > Preferences > Privacy & Security. If Strict is enabled, please change this to Standard.
Once you have completed reviewing your browser’s Privacy & Security preferences, please close the active browser and re-open a new browsing session so that any changes can take effect.
An issue has been reported with Turnitin where users trying to access assessments using Safari are getting an “Invalid or Missing state” error and are unable to access the assessment.
We have reported this to Turnitn and will update this post with further updates. In the meantime can all IOS users use an alternative browser such as Google Chrome