In your case, if you haven't received your oath ceremony invite- you simply have to wait. Since you said you have to leave by end of January there is no way you are going to have your passport with you by then. Because you will get oath invite via email 2 weeks prior to the schedule date and then comes Oath ceremony. After ceremony it will take around 2-4 weeks to get your citizen certificate by mail which is required to apply for passport.
The only thing you can do is to wait for the oath invite email in which they have provided a number or you simply have to reply back to that email the reason for being out of country (My visa office is Mississauga, yours can be different). Then may b they will find a solution or reschedule your date. Please read the email below:
***Please read the attached Notice to Appear carefully to verify the date/time of your appointment and to ensure you have all required items listed on the Notice to Appear in order to be eligible to participate in your Citizenship Ceremony.
Important:
·
If you are unable to attend this event, please read the information in the Notice to Appear, and contact us
as soon as possible at
CIC-Mississauga-Citizenship@cic.gc.ca or at the mailing address mentioned on your Notice to appear. Please include a reasonable explanation as to why you are unable to attend.
· If you are planning to travel outside of Canada using a Canadian passport shortly after your scheduled Citizenship Ceremony, we recommend that you
don’t finalize your travel plans until you apply for and receive the passport. For further passport information on locations, timelines, fees, policies and procedures, please consult the website at
https://www.canada.ca/en/immigration-refugees-citizenship/services/canadian-passports.html
· It is very important that we are notified of any changes in your contact information (i.e. address, email, and telephone number). Please visit our Web site at
www.cic.gc.ca for information on:
1. How to change your contact information;
2. Application processing times;
3. Checking the status of your application.
I hope this helps. Please do not worry this can be reschedule, this is not once in a lifetime opportunity. You will be fine.
All the best