Unable to access props member in vuejs

Member is undefined even when I have it in my props and it works fine in the template.

    props: {
        member: Object,
        sponsor: '',
    },

    setup () {

        const form = useForm({
            email: null,
            name: null,
            relationship: '',
            address: '',
            gender: '',
// This line returns member is undefined. 
            member_id: this.member.id,
            mobile: '',
        })

        return { form }
    },