Check if a string is among the values of a map that has vector of strings as values

I want to check if a string is among the values of a map which holds vectors of strings as values

typedef std::map<std::string, std::vector<string>> ClusterDescription;
std::map<std::string, std::vector<string>> clusterDescription;


std::vector<string> vec1 = {"11", "22", "33"};
std::vector<string> vec2 = {"44", "55"};
std::vector<string> vec3 = {};

std::string key1 = "1";
std::string key2 = "2";
std::string key3 = "3";

clusterDescription.insert(std::make_pair(key1, vec1));
clusterDescription.insert(std::make_pair(key2, vec2));
clusterDescription.insert(std::make_pair(key3, vec3));

std::string ID = "44";

for (ClusterDescription::iterator it = clusterDescription.begin(); it != clusterDescription.end(); ++it)
{
    std::vector<std::string> clusterMembers = it->second;
    if(std::find(clusterMembers.begin(), clusterMembers.end(), ID) != clusterMembers.end())
    {
        std::cout<< " I received an msg, from the wrong head "<< std::endl;      //FIXME:
        break;
    }
    else
    {
        std::cout<< " I have not been included in any cluster yet "<< std::endl;        //FIXME:
        std::cout<< " sending joinmode msg "<< std::endl;
        break;
    }
}

Here the code works fine for the values: 11, 22, 33. But it fails for the other cases. What am I missing?