Understanding const reference returned from a function

I have a function

const std::string& getRecordingJobToken() { return getToken(); }
const std::string& getToken() const { return m_Token;  }
std::string m_Token;

I am able to call it as below

const std::string jobToken = getRecordingJobToken();

However when I do this,

const std::string jobToken;
jobToken = getRecordingJobToken();

It throws me this error –

error: passing ‘const string’ {aka ‘const std::__cxx11::basic_string’} as ‘this’ argument discards qualifiers [-fpermissive]

What is the difference ?
I know that a reference variable has to be initialized immediately.

std::string &ref = a;

Is it some similiar logic ? The reason i am confused is that though getRecordingJobToken() returns a const reference, the variable jobToken that I have is not a reference variable. It is a variable that is used to take a string reference being returned from the getRecordingJobToken() function.

>Solution :

Initialization and assignment are different things. jobToken is const, it could (and must) be initialized, e.g.

const std::string jobToken = getRecordingJobToken(); // copy-initialization

but can’t be assigned (modified) later, e.g.

const std::string jobToken;        // default-initialization
jobToken = getRecordingJobToken(); // fails; assignment