json.hpp won;t compile VS2019 CLR/CLI app but does in console app

[dmfoley734]

I am very new to c++ and trying to use the json.hpp within a CLR/CLI app but the compiler is having trouble and returning '': cannot convert from 'std::basic_string<char,std::char_traits,std::allocator>' to 'BasicJsonType'
with [ BasicJsonType=nlohmann::basic_jsonstd::map,std::vector,std::string,bool,int64_t,uint64_t,double,std::allocator,nlohmann::adl_serializer ] @ the bool key(string_t% val)
but when compiled in a console app there are no issues

bool key(string_t& val)
{
BasicJsonType k = BasicJsonType(val); <<<<<<<<<<<<<<<<<<<ERROR

    // check callback for key
    const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::key, k);
    key_keep_stack.push_back(keep);

    // add discarded value at given key and store the reference for later
    if (keep and ref_stack.back())
    {
        object_element = &(ref_stack.back()->m_value.object->operator[](val) = discarded);
    }

    return true;
}

I have tried copying the single include code directly into a new hpp file, building under Default, C++14, C++17

Windows 10 SDK latest, Visual Studio 2019 v142, C++ Default

Receive the same error in 3.5,3.6 and 3.7 versions

[stale]

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