Just received test invitation, followed instructions and emailed I was outside of the country sending requested info:
An hour later got a response:
Dear Applicant
Thank you for contacting Immigration, Refugees, and Citizenship Canada. To proceed with the online test from your location outside Canada you can access the link in the test invitation that was previously emailed to you within the specified time period.
Important: System changes underway - When you sign in to the online test, you will need to go through a privacy notice. One of the questions will ask if you are physically present in Canada while taking the citizenship test. Though we acknowledge you may be located outside Canada, please check the box. This is necessary to complete the test until system changes can be implemented.
Good luck on your citizenship test!
Citizenship Official
Immigration, Refugees and Citizenship Canada