Google Sheets, need to edit a column based on two columns on a second sheet - google-sheets

Question

Good morning!
I've been searching high and low for how to do this, and while I feel like I get close I can't get anything more than 'invalid formula' from the conditional formatting in google sheets. So here's what I'm trying to do;
Column C on sheet 1 (Working List) needs to have a red background if the following conditions are met;
Column 'P' on sheet 2 (Complete) has the 'Address Changed' option in the drop down box (its the first one on the drop down, I've been struggling to figure out if it needs to be a '0' given its position in the list or if its 'Address Changed')
Column 'C' on sheet 2 has the same account numbers in Column 'C' on sheet 1.
I can set it up to find duplicate accounts, but I can't seem to figure out how to get the first rule for the drop down box to work. Advice?
Attempts thus far, none of them worked, all were tried separately and not in conjunction with each other. Google just says 'invalid formula' and won't save it or do anything with it.
=and(EQ(Complete!$O, "Address Changed"), EQ('Working List'!$C, Complete!$C))
=match($C2, indirect("Complete!$C:$C"), 0)
=if(EQ, indirect("Complete!$O, "Address Changed""), EQ('Working List'!$C, "Completed!$C"))
=and(indirect("Complete!$O:$O,$O="Address Changed""))
so I've tried to figure out a better way to get it working, and this is what I think might be closer to the answer.
=and(if($O:$O,indirect("Complete!$O:$O),0)),[match($C2,indirect("Complete!$C:$C"),0)]
***Friend helped me solve this. The following worked for what I needed....
=index(indirect("Sheet2!O:O"), match(C1, indirect("Sheet2!C:C"), 0)) = "Address Changed"

Answer 1

Take a look at this sheet with some foo data I built based on your sheet.
https://docs.google.com/spreadsheets/d/1RcM5WX3KWgWq-WWuPgyF-PZe3RP99qWF-IRpSr35Zik/edit?usp=sharing
I used some helper column, as you see.
if sheet2!P1 is changed to "Address Changed" K1 will have value of 1. This is a simple IF function.
if sheet2!C = sheet1!C, L will change to 1. This is another simple ARRAYFORMULA(IF())
Finally, column C will be formatted with the data from K1 and L by this formula
: =AND(L2=1, $K$2=1)
You can then hide the helper column / cell.
If you don't want to use helper column, look at the formula in column D :
=AND(INDIRECT("Sheet2!C2:C") = C2:C, INDIRECT("Sheet2!P1")="Address Changed")
This will serve your purpose.
You cannot refer to another sheet directly in conditional format formula, hence if you don't want to use helper column, you will have to use INDIRECT. This is also the reason why your formula failed in the first place.
I personally wouldn't recommend you to use INDIRECT though...