On March 18, 2021, the government updated their guidance for benefits issued under the CRB Act in respect of ineligibility for periods of quarantine due to international travel. It is consistent with previous commentary and legislation. It notes:
This does not apply to you if you were isolating because:
you travelled for medical treatment certified by a medical practitioner
you accompanied a person who is not able to travel without help from an attendant to get medical treatment certified by a medical practitioner
you are an essential worker who travelled for reasons normally exempt from quarantine when you return to Canada (such health care workers or truck drivers who need to cross the border for work) but were required to this time
If one of these exceptions applies to you and you meet all other eligibility criteria, call the CRA to apply: 1-800-959-8281