Because in the chaos of online learning, a simple number and a password is still the most democratic interface. It doesn't require a specific browser. It doesn't need a school email alias. It just needs two fields and a deadline.
This is the most common error. Remember that enrollment keys are case-sensitive . Double-check for extra spaces or transposed numbers. If it still doesn't work, contact your instructor—only they can reset or verify these codes. turnitin class id login