Symptoms

 Assessment Instance created for demand do not showup in the related list on demand

Steps to Reproduce 

1 >Go to Demands and open any demand or create a new demand 

2> Go to Assessments - Assessable Records and open any asmt_assessable_record

3> Click on Assign Assessment UI Action to ontop right and select the user

4> Impersonate as that user and Open the demand again 

5>check the related list assessment instance - no record is shown

Resolution

Currently we are not showing Assessment instances at Demand level, showing in Assessment group of Assessment Results. Follow the below path to see the Assessment Instances,
Go to Demand -> Assessment Results(related list) -> Assessment Group -> Assessment Instances(Related list).

Please refer : https://docs.servicenow.com/bundle/london-servicenow-platform/page/administer/assessments/concept/c_AssessmentGroups.html

Assessment results will be created at Demand screening level.
OOB Steps to produce Assessment Results:
Role: assessment_admin or admin(*Abel tuter does not have this role, so that you are not able to see the Assessment Results)
1 -> Create Demand
2 -> Submit Demand
3 -> Screen Demand
4 -> By default three records will be created with assessment group in related list Assessment Results if any stakeholders did not take the assessment.
If Assessment Results are not generated then see the Assessment -> Metric Definition -> Types -> Demand, look for the Schedule type field value. Based on {On Demand/Scheduled} this value Assessment Results will be available.
https://docs.servicenow.com/bundle/london-servicenow-platform/page/administer/assessments/concept/c_ScheduledAssessments.html.