Hello,
If you try to use a constant array, you may get an error message, "You may not use reference operators (such as unions, intersections and ranges) or array constants for Data Validation criteria." As such, the list must be a delimited list, or a reference to a single row or column. For a detailed information, please refer to the following articles:
- Detect errors in formulas
- Use formulas with conditional formatting
- Use array constants in array formulas
Let us know if you have additional questions and we'll be happy to assist you.