FYI, for anyone else who encounters this issue... Apparently my CRA security code is expired, and because I haven't completed two tax returns (despite the most recent not even being due yet), I am locked out of my T slips and cannot use auto-fill. I am told they can send me my 2021 T slips by Canada Post, and then I can call back to get my security code reset (which they also send by Canada Post), so that I can eventually auto-fill my 2022 return. So annoying. The CRA guy on the phone said to make sure you log onto your CRA account every year to make sure the security code doesn't expire... which I thought I had done, but that's the only advice I got.