This article explains the "Unable to Assign You" error.
Error
"Unable to Assign You"
Solution
You may encounter a message that states "Unable to Assign You" once you enter your PIN and click the Accept button for a particular job.
This message appears when the job is no longer available, and it occurs if the job was changed to a state where it cannot be accepted. (If the job is currently being edited, it will reappear on Jobulator once the teacher or administrator saves the changes.)
We recommend you click the Refresh button to check the job's current availability.
If the job reappears, it is likely now ready for you to accept.