Token Endpoint Returning HTML

I am trying to get a bearer token from the https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token endpoint. This works fine in postman, but when I try to run it from my node js app, it returns the Sign In html page instead of the bearer token. See code below for implementation:

const tokenUrl = 'https://login.microsoftonline.com/<tenant>/oauth2/v2.0/token';  
const clientId = '<id>';  
const clientSecret = '<secret>';  
  
const form = FormData();  
form.append('client_id', clientId);  
form.append('scope', 'https://graph.microsoft.com/.default');  
form.append('client_secret',clientSecret);  
form.append('grant_type', 'client_credentials');  
  
const getToken = () => {  
  axios.get(tokenUrl, form, {  
    headers: {  
      'Content-Type': 'application/x-www-form-urlencoded',  
      'Host': 'login.microsoftonline.com',  
    }  
  }).then((response) => {  
    return response.data.token;  
  }).catch(e => console.log(e));  
}  

I'm sure I am missing something simple, but I am new to Graph API, thanks in advance for the help.