What did you write to them? You need to include all these info:
Email us at IRCC.COVID-TravelExemptions-Exemptionsdevoyage-COVID.IRCC@cic.gc.ca and provide all the following information for you and your immediate family member in Canada:
· Full name
· Date of Birth
· UCI
· Application Number
· Passport Number
· Detailed purpose of travel
· Proof of relationship with an immediate family member in Canada
· Proof of immigration status of the immediate family member in Canada
· Proof of Temporary Resident Visa or Electronic Travel Authorization
Note: You must demonstrate that you are travelling for essential reasons as immediate family members of FN are not exempt from travel restrictions. If you don't meet the requirements, they will not reply to you. You reach to them to get the authorization letter which is what they mean by exemption. You still need to prove that you are not travelling for discretionary purpose.
A person I know wrote the same reason I did and yet got the letter. I wrote just 2 days post hers.