=IF(OR(Done671 = 1, [% Complete]671 = 1), "Green", IF(OR(TODAY() > [Due Date]671, [Team Issue]671 = "Major issue (Red)"), "Red", IF(OR(TODAY() > [Due Date]671 - 5, [Team Issue]671 = "Minor issue (Amber)”, TODAY(INT(Duration671 * (1 - [% Complete]671))) > [Due Date]671), "Yellow", "Green"))))
Please note I have ensure all the Column Names are in accordance.
Thank you!