What's causing the 'API rate limit exceeded' error in Rust's Reqwest even though I've included my Github token?

Although the code has the Github token included, for some reason I am still unable to avail more GitHub Rest API quota.

I am using Reqwest for Rust to process all requests. I believe that I may be entering my token incorrectly.

The Code

        let mut headers = HeaderMap::new();
        headers.insert(USER_AGENT, HeaderValue::from_static("SBSixteen"));
        headers.insert(AUTHORIZATION,HeaderValue::from_static("github_pat_****************************************************") );
        let client = Client::builder().default_headers(headers).build().unwrap();
        let url = format!("https://api.github.com/users/{}",data.git_username);

        println!("{}", &url);

        let r1 = client.get(&url).send().await.unwrap().text().await.unwrap();
        println!("{}", &r1);

The Error

{"message":"API rate limit exceeded for ***.***.**.*. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting"}
thread 'tokio-runtime-worker' panicked at 'called `Option::unwrap()` on a `None` value', src\NER_EZH.rs:632:38
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I tried multiple possible combinations but I am unable to set my token correctly.

From the GitHub API documentation, we can see that authorization tokens are expected to be presented as "bearer tokens." You just need to prefix the token with "Bearer ":

headers.insert(
    AUTHORIZATION,
    HeaderValue::from_static("Bearer github_pat_***..."),
);