'Why yup validation is not working when matched for a specific value?

I have a scenario where I have to put a check on a field (btext) value based on another field's (aText) value. The check will only be applicable when the other field has its value equal to a predefined reference value (predefinedValue). Below is my yup validation code

export const bText = yup
  .string()
  .when("aText", aText => {
    if (aText === predefinedValue) {
      console.log("its here");
      return yup.string().required("Required");
    } else return yup.string();
  });

The validation works when pre-defined value is matched and bText is left unfilled. But even if bText is filled the validation doesn't pass. Where am I going wrong ?

formikyup


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