Hi, thank you for using Intuit ProFile Community
The ProFile development team is working on fix for T183 signing issues for ProFile 2020.4.0 targeted for the end of Mar 2021.
The recommended work around is to signoff the error 1320 in the auditor before attempting to enter the date. If you print the T183 then lock the return, date entry is an issue after the return is unlocked. Note with a DCN change after clearing form T183, the DCN may not have the same DCN in ProFile as the signed copy. This may cause issues with CRA.
I apologize for the inconvenience but hope this helps
