79534283

Date: 2025-03-25 16:28:21
Score: 2
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As what @Tedinoz has mentioned in the comments:

You may try using Conditional Formatting and use Is empty on the format rules

since on Data Validation:

the data validation sensor is not activated until there is a value entered in the cell. So an empty cell does not count as "data" and the DV evaluation is not run.

As per this public forum.

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Posted by: Gyul