I am getting the same error. I downloaded the T4s and entered the correct amount from the RL-1 on the T4 via the TurboTax Online interface since the online version does not have Form View. CRA error code #84 provides 3 considerations all related to CRA Form line 50310 not matching other things. For sure it is not being generated by TurboTax, but at the same time I can not find this line in the T1, Schedule 8 or RC381 forms downloaded directly from CRA.
