=IF(AND formula returning "invalid Operation" error

I have several check box columns. When all are checked, I want to turn on a flag in another cell.

I first tried testing two of five check box fields and Smartsheet returns "invalid operation"

=IF(AND(COI:COI = "1", EFT:EFT = "1"), "1")

What am I doing wrong?

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=IF(AND(COI@row = 1, EFT@row = 1), 1)

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