You can take test from anywhere no restrictions on that.
Also you can write test even if you haven't got the email, below is the response I got from my friend
May be VO didnt sent an email due to on going fiasco. But my gut feeling is that test window should alrdy be in gcms and system and you would be able to proceed.
You don't need email, try to login on test link on 24th and proceed, I'm sure you should be able to proceed. Unless its moderated oath, other users in past with no email in normal situation were able to proceed normally hence you should as well. Good luck!
If you are not able to login on 24th, email to technical team (
IRCC.CitOnlineTest-TestenligneCit.IRCC@cic.gc.ca). They should put you in.
PS: this email is only for test link tech support.
Here is the test link
https://ct-tc.apps.cic.gc.ca/?lang=en