Recapture of Advanced Child Tax Credit on Form 1040NR - doesn't carry over from the Form 8812 to the Schedule 2

[caj111]

I have a client who files a Form 1040NR and was mistakenly paid the Advance Child Tax Credit during 2021 (they were no longer in the USA) and needs to pay the credit back by filing a Form 1040NR.  I have gotten as far as doing the Form 8812, which now shows they have additional tax owed of $900, and it says this is to be entered on Schedule 2, Line 19.  When I go to the Schedule 2, the $900 does not carry over to line 19 on that schedule, and you can't change that line on the Schedule 2.  I have fiddled with the Schedule 2 worksheet and gotten nowhere.  Does anyone have insight on this, or if an employee is reading this, please help!