Validation Error about formik HOT 4 OPEN

const settingsFormik = useFormik({
        initialValues: {
            type: '',
            account: '',
            opening_balance: '',
            account_name: '',
            account_number: ''
        },
        validationSchema: Yup.object().shape({
            type: Yup.string().required('Account type is required'),
            account: Yup.string(), // Optional field
            opening_balance: Yup.number().typeError('Opening balance must be a number').required('Opening balance is required else enter 0'),
            account_number: Yup.string().when('type', {
                is: () => 'bank',
                then: () => Yup.string().required('Account number is required'),
                otherwise: () => Yup.string().notRequired(),
            }),
            account_name: Yup.string().when('type', {
                is: () => 'bank',
                then: () => Yup.string().required('Account name is required'),
                otherwise: () => Yup.string().notRequired(),
            })
        })
    })