has the northern deduction for trips changed?

Every year for 10 years I have received this deduction and for some reason it's not applying it this year. Have the rules changed?

Self-employed

The rule didn't change as long as you qualified for living in zone A and B of your province of residence.  You also need to enter the dates you lived in the prescribed zone during 2024 

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...