If you've entered an amount from any of the boxes on the slips listed here, you have what the Canada Revenue Agency (CRA) considers to be self-employment or business income:
T4 slip: box 81, 82 or 83
T4A slip: box 20 or 48
T4A slip: box 28 and you selected Yes to the question Does the income declared in Box 028 consist of fees collected for services you provided? in TurboTax Online (needs to say NO to indicate no self-employment)
T3 slip: box 24 (foreign business income)
For more information please see our TurboTax FAQ: Why did I have to upgrade my TurboTax Online edition?
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None of those apply, there were no slips with any amounts in those boxes.
Tried working with the support desk as well, they suggested to not import from last year and enter everything manually from scratch. My time was worth more than the $20 to upgrade so I just paid and moved on as redoing it all was a waste of effort in my opinion. I have used the Premier version with identical slips for many years with no issue until this year.