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Hi,
The column is of plain text type and its name is Email, in the formula the name was StudentEmail, I changed the name to email and in the formula too, but even using the original name it doesn't work (StudentEmail)
I know there is a column of type Person/Group but as they are external emails this field does not serve us. That's why I'm using the plain text field, and I'm trying to do this validation to prevent other things from being informed in this field.
Best Regards
Peterson