I got married in 2023, my American husband is still living in the US as we wait for his immigration to finalize. He doesn't have a Canadian SIN, how should I proceed?

He's working and living in the US as we wait for his Canadian immigration to finalize. I can change my status to Married, but it asks for his Canadian SIN number.

After you file

You can use 000 000 000 in the SIN number spot.