The conditional formatting feature is disabled on a protected sheet. So, be sure to turn off the worksheet protection before creating a rule (Review tab > Changes group > Unprotect Sheet). If you don't have much experience with Excel conditional formatting...
Protecting a worksheet in Excel not only locks cells but also ensures that your entire sheet (or specific parts of it) is safeguarded from unwanted changes. Heres how you can protect a worksheet step by step: Step 1: Go to the Review Tab.

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These situations can restrict certain Excel features. How does sheet protection cause conditional formatting to be disabled? When a worksheet is protected, editing features, including conditional formatting, are often disabled to prevent accidental changes.

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Explore Stack Internal. Conditional Formatting from another sheet. Ask Question.That works for a single cell, but as the "Sheet2!A1" is protected by double quotes, it won't respond to copy-paste through multiple cells and won't change the value to A2, A3, etc.

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Conditional formatting is an advanced Microsoft Excel feature that allows you to apply formats to a cell or range of cells and have that formatting change depending on the value of the cell or the value of a formula.FormatConditionCollection fcs = sheet.ConditionalFormattings[index]