I have undeleted the thread, but basically the answer that was originally given in March 2021 was " For SIN or identification numbers that have 6 or 8 digits only, simply put zeros in the front so that the total number of characters is 10 digits long in the RL-24 Box H." followed by multiple people saying it didn't work. The last post is me in 2023 giving the same answer I gave to you.
So, maybe try adding zeros to the number in Box H to make it 10 digits - it worked for at least one person.
