Custom function throws a “You do not have the permission required to setValue” error

from the documentation :

Custom functions return values, but they cannot set values outside the cells they are in. In most circumstances, a custom function in cell A1 cannot modify cell A5. However, if a custom function returns a double array, the results overflow the cell containing the function and fill the cells below and to the right of the cell containing the custom function. You can test this with a custom function containing return [[1,2],[3,4]];.

reference : Custom Functions in Spreadsheets

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