I want to point out that you mention that the rrsp deduction limit can be found at line A of the notice of assessment. There is no line A on my notice of assessment.

Seniors and students

This Canada Revenue Agency (CRA) page lists all the ways you can find your RRSP deduction limit: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/rrsps-related-plans/contribu...