ImpersonateUser.scala

private def impersonateUser(token: String, userId: String): Future[Seq[(String, String)]] = {
  sttp
    .post(uri"${config.authServerUrl}/admin/realms/${config.realm}/users/$userId/impersonation")
    .auth.bearer(token)
    .send()
    .map { r =>
      val currentTime = ZonedDateTime.now()
      r.cookies
        .filter(_.expires.forall(_.isAfter(currentTime)))
        .map(cookie => (cookie.name, cookie.value))
    }
}