Generally, the notification on the dashboard for interview comes in a couple of weeks early with an interview date. You will then receive an interview email about a week before the interview. So, AFAIK, you'll have about a couple of weeks time from notification to the interview date.Well given that interviews can take place from the day after the test to upto two months…they’d be pretty stupid to say take the test outside of canada today but your interview hypothetically scheduled for two days time needs to happen in Canada….I’m in the UK but it would be ludicrous for people currently in India so yes let’s wait and see….
Yes, it would be pretty stupid if they don't allow interviews from overseas but since there isn't a single confirmed report or anything on the IRCC website (at least I can't find anything on the IRCC website) that suggests applicants can attend interview from outside Canada, it is best to assume you can't do that unless someone posts a report saying they've taken interview outside Canada or IRCC updates their website or posts on Twitter that applicants can indeed take attend an interview overseas.
I know the rules don't make sense sometimes but I'm just erring on the side of caution here.
If you receive an interview request, send an email to the email ID in the interview invitation letter email and ask if you could attend the interview from overseas. Please keep us posted if IRCC responds.
Wish you all the very best!