Greetings wouldbeca,
There is no reason to select the sheet first, but disregarding that for the moment, you need to 'double-up' the quote marks within the string, to have it write the formula to the sheet correctly.
Sheets("SCB_Rejection_Working").Select
Range("A5").Formula = "=IF(ROW($A1:A1)>COUNTIF(SCB_Rejection!A:A,""*"")-1,"""",SCB_Rejection!M2)"
I hope that helps,
Mark