My sessional average is a 10.0 (meeting the 9.5 cutoff for Dean's List) however my grade report does not state Dean's List on it. Does anyone know why this might be?

You probably haven't taken enough units (30 units) in the session from Sept to April. To be on Dean's List, you have to take at least 30 units from Sept - April and have an average greater than or equal to 9.5.

It could also be just taking some time until it's assessed. Maybe contact the Registrar's office to verify.

this is straight from the site

"Each year outstanding students with a minimum average of 9.5 on at least 30 units (usually their Sessional Average) are named to the Deans' Honour List. Students will be assessed at the reviewing period (either after the Fall/Winter or summer session) when a minimum of 30 units (may not exceed 6 units that are pass/fail) has been completed since the previous Deans' Honour List review. At each review the assessment will be based on all units completed since the previous Deans' Honour List review."