ambiguous call of overload template function using decltype in google client library

I'm currently tried to build google cloud client libraries on windows. On build the final library I run into function call is ambiguous. They have the below code in a header pagination_range.h. The issue google response class sometimes have both or none of the declared functions would this ever be able to run/compile with c++11 in msys or msvc

typename StreamReader<T>::result_type GetNext() {
    if (current_ == page_.end()) {
      if (last_page_) return Status{};
      request_.set_page_token(std::move(token_));
      auto response = loader_(request_);
      if (!response.ok()) return std::move(response).status();
      token_ = ExtractPageToken(*response);
      if (token_.empty()) last_page_ = true;
      page_ = extractor_(*std::move(response));
      current_ = page_.begin();
      if (current_ == page_.end()) return Status{};
    }
    return std::move(*current_++);

template <typename U>
  static constexpr auto ExtractPageToken(U& u)
      -> decltype(std::move(*u.mutable_next_page_token())) {
    return std::move(*u.mutable_next_page_token());
  }
  template <typename U>
  static constexpr auto ExtractPageToken(U& u)
      -> decltype(std::move(u.next_page_token)) {
    return std::move(u.next_page_token);
  }