This LITERALLY just happened to me. I have never been refused a visa. I have never been refused whilst flagpoling.
The visa i am currently on is approved since 2023 even though this was selected:
Previous visa selected option for this question (answer i selected was NO)
And just like OP, I just recieved a PFL (November 2022 stated despite already being in canada): "You have indicated "No" to the following statutory question "Have you ever been refused a visa or
permit, denied entry or ordered to leave Canada or any other country?"
There is information on file that indicates that you have not answered this question truthfully.
As a result, I have concerns that you do not meet the requirement of the Act, namely, to answer
truthfully all questions.
Before I make a final decision, you are provided an opportunity to submit the requested information
above as well as any additional information relating to these concerns."
I've got 10 days to reply. Please tell me someone has some insights. I'm trying to contact a lawyer ASAP. This is literally life ruining.