Hi guys,
While I am waiting for the 'Citizenship Certificate' to arrive. I was trying to come up with the logic for the delay in citizenship certificate delivery.
Maybe i am thinking out loud →
The citizenship certificate is signed by the "Registrar of the citizenship". The definition of "Registrar of the citizenship is the presiding offer/citizenship Judge on the govt site.
In my case, my IRCC office was "Mississauga " but the preceding offer was from Montreal. My oath was on 20th Jan and case status was closed the next day 21st. When I called IRCC they said my certificate is printed and mailed on 21st itself. Now I believe the certificate mailed here means, they sent it to the Montreal (citizenship Judge office to sign and sent it back to Missusaga office) obviously via regular mail. Now when the Mississauga office will receive a signed Citizenship certificate, then they will mail it to me via regular mail (hence they need 2 to 4 weeks' time to deliver). People with the same city preceding officer in their oath ceremony might get it in under 2 weeks. And for urgent processing, IRCC might be using express post-one-day delivery.
My 2 cents (completely my own logic - I might be wrong)