If learners are not seeing their scores, it is due to a mistake in the property settings. You need to tick two boxes: "Show correct answers at the end of the assessment" and "Show the score (%) at the end of the assessment". This ensures that learners can view their own answers, see their score and the teachers feedback.
How to edit assessment settings
1. Open you assessment and click on edit:
2. Open assessment settings
3. Check that settings allow them to see their answers, correct answers and score
4. Do also check that the assessment timing has not passed
If it has, learners cannot see their responses nor the feedback.