I had no problem , when they send the sponsorship letter to me i got the PCC done and submitted through webform .Hello, I noticed that you did an upfront PCC, did IRCC have any issues with that? I'm thinking of doing the same.
I gave them the PCC from the local police station which was actually not correct but somehow they accepted it , to get the correct one you must apply thru passport office ( See below link ) . i thought they will ask me PCC again so i got the new one too but they never asked ( So i did not submit ) . There was a wait time of about a month for us to get PCC from passport office ( In India , not sure about other country but follow the link ) . If you have got the sponsorship approval letter then get the PCC and submit it upfront.
PCC - How to get a police certificate – Immigration and citizenship - Canada.ca