OAuth Token | 403: invalid token | Typescript/React

UPDATE: 

This issue is intermittent. I have gotten a positive response to this code. I’ve adjusted it for better error handling. 

const fetchUserData = async (accessToken: string) => {
    fetch(`https://api.figma.com/v1/me`, {
      headers: {
        'Authorization': `Bearer ${accessToken}`,
        'Content-type': 'application/json'
      }
    })
    .then(response => response.json())
    .then(response => {
      if (response.status >= 400) console.log(`${response.status}: ${response.err}`)
      else {
        console.log(`Logged into Figma as ${response.handle}`);
        setUserData(response);
      }
    })
    .catch((error) => {
      console.error('API Request Failure:', error);
      throw new Error (`API Request Failure: ${error}`);
    });
  };

To clarify: 

My original issue persists. Without altering the request code, I most commonly get a 403 while requesting data from the Rest API. Above is one of the requests returning said error. 
 

Also, when requesting a new OAuth Token, I have a 50/50 chance of getting a token that results in the issue above, but, also get a 429 or 400.