Zod type email string and number message not working correctly

const authschem = z.object({
  email: z.union([
    z.string().email({ message: "Please enter a valid email address" }),
    z.number()
      .min(10, { message: "Invalid number" })
      .max(10, { message: "Invalid number" }),
  ]),
  password: z.string(),
});