Struggling with Sudoku Solver Recursion [Closed]

Hello everyone, for the past 2 weeks. I am having difficulties with the recursion part of the code. I have tried to apply the recursion method from this website, yet it does not work when I applied it onto Replit.

Is there something that I am missing or I am currently doing wrong?

Your project link(s)
My Replit

I believe I have found the error of my code. When I console logged my row, column and region placements, all of them are undefined. I still did not figure out how to fix that problem.

Challenge: Quality Assurance projects - Sudoku Solver

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