State tax filing

I am a foreign resident and I had no trouble filing electronically to South Carolina.  However, this year I am receiving code 0008 when my return is being rejected.  I have followed the suggested fix and it still will not be accepted by SC.  The fix is to enter my province code which I did using the ISO website.  It still is rejected.  But again, I was able to e-file last year (tax year 2018) without any rejection