map lookup error: cannot convert pair to enum value

I saw the following code suggested for creating a map lookup in another thread on stack overflow (I've modified it for my purposes but the general structure remains the same).

#include <string>
#include <map>
#include <algorithm>
using namespace std;
namespace kwd { //define namespace
    enum Options{ //enumerate alternatives
        Option_Invalid,
        assert
        //repeat for more options
    };
Options resolveOptions(string input){ //find enum values
        static const map < string, Options> optionStrings { //inputmap
            { "assert", assert }
            //repeat for more options
            };
//finally closing with
    auto itr = optionStrings.find(input);
    if( itr != optionStrings.end() ) {
        return *itr;
    }
    return Option_Invalid;
    }
}
string commentMake(string commentarray[]) {
        int commentarraylen =sizeof(commentarray)/sizeof(commentarray[0]);
        string comment = "";
        for(int i =0; i < commentarraylen; i++){
            switch (kwd::resolveOptions(commentarray[i])){
            case kwd::Option_Invalid:
            comment += commentarray[i] + " ";
            break;
            //repeat for more options
}}}

I need it or another method to look through a large number of different cases multiple times quickly so i want to avoid If-statements (since i understand they're quite slow). However when i run it i receive the following error:

spoofcode.cpp: In function ‘kwd::Options kwd::resolveOptions(std::string)’:
spoofcode.cpp:28:16: error: cannot convert ‘const std::pair<const std::__cxx11::basic_string<char>, kwd::Options>’ to ‘kwd::Options’ in return
   28 |         return *itr;
      |                ^~~~
      |                |
      |                const std::pair<const std::__cxx11::basic_string<char>, kwd::Options>

what would be a possible way to resolve this, or alternatively, is there another way to do it?