Microsoft 365 and Office | Excel | Other | Windows
A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
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Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
Apparently you cannot create such a data validation rule in Excel Online. You'll have to do so in the desktop version of Excel for Windows or Mac.
The rule will then work in Excel Online too.