Auto-Fill My Return doesn't work. I can log in the CRA website and download the slips, but when it imports, I got the "Oops, we encountered an error" screen.

[CannyGranny]

I encountered this issue, too! I have a lot of T5008 Securities slips, and the TurboTax Assistants recommended I try to download them instead of typing them in (after I had typed many of them, but not all). 

When I tried to download my T-slips,  it connected to CRA but  resulted in an error, and no slips downloaded. My husband works in tech, and helped me try to troubleshoot.

We noted that My CRA required him to authorize me as his CRA Authorized Representative to get access to any information with his SIN. Once this process was complete in the CRA site, we could access information for both of us. TurboTax did not download any slips. 

I typed in pages of T5008 slips into Capital Gains, and found TurboTax would not generate enough lines to be able to enter them all. I deleted almost all of them, and entered a summary of the rest.

We have not been able to download ANY T-slips from the CRA through TurboTax.

[TurboTaxSusan]

@CannyGranny Unfortunately, if you have too many slips to auto-fill, there is no way to reduce the amount of slips that TurboTax tries to pull in to stop the error. So, you will have to enter your other slips manually.