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I've tried everything. I've tried it with a laptop and an app. I've tried it with vpn, but it doesn't work. My t1 won't open.

What were you trying to do or what page were you on when you got this error? Are you outside of Canada?

Yes, I'm in South Korea now. I got this page on the "finish and file". I would like to open my link of return. But i cannot see my pdf of return. Only that error. I tried the things you guys told me to try over there.

@lalal364 We've opened an investigation into this error, and the dedicated team is working to resolve it. Once they have investigated and found a solution, they will contact you via email. I linked your case to the investigation. You will be notified by email. We appreciate your patience.