I can't get user id in TS file in Angular

_id: undefined Http failure response for http://localhost:5000/users/undefined

Service File:

UpdateUser(userID:any, data : any){
  return this.httpClient.put<User>(`${environment.APIURL}/users/${userID}`,JSON.stringify(data),this.options)
  .pipe(map((res:any)=>{
    return res
  }))
}