### ROOT CAUSE
The issue arises because the `context` passed to the validation function is not being properly provided by Formik. Formik does not automatically pass context to the validation function unless explicitly specified. The validation function expects the context to be provided via the `validationContext` prop in the Formik component.
### CODE FIX
Pass the context to the Formik component using the `validationContext` prop and ensure the validation function accepts the context as its second argument.
**Example:**
```jsx
import { useFormik } from 'formik';
import * as yup from 'yup';
const validationSchema = (data, context) => {
return yup.object().shape({
field: yup.string().required(context.requiredMessage),
});
};
const MyForm = () => {
const formik = useFormik({
initialValues: { field: '' },
validationSchema,
validationContext: { requiredMessage: 'This field is required' }
});
return (
);
};
```
**Explanation:**
- The `validationContext` prop in the Formik component provides the context object to the validation function.
- The validation function must accept two arguments: `data` (the form values) and `context` (the passed context object).
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