Why universal reference does not work?

I have problem with this piece of code:

#include <string>
#include <iostream>

struct A{
    template<class UT>
    A(UT &&s) : internal(std::forward<std::string>(s)){

    }

    std::string internal;
};

int main(){
    const std::string &s = "hello";

    A a1{ s };

    std::cout << "s = " << s << std::endl;
}

This current example does not compiles and if I change s to be non const, it moves the string.

I have similar codes that works OK, but in this case there is something wrong I can not see.