I'm trying to build a reddit-like app on react native, so i'm using axios to fetch requests to Reddit Api and I can't seem to be able to fetch any POST requests, I've tried everything I can, I'm trying to subscribe to a subreddit, here is my request :

subscribe: async function subscribe(action, sub, modhash) {
       try {
    const token = await this.getAccessToken();
    console.log('token: ' + token)
    let Headers = {'Authorization': 'Bearer ' + token,
      'Content-Type': 'application/json',
      'X-Modhash': modhash}
    let Params =  {'action': action, 'sr_name': sub}
    let Body = {'api_type': "json", "extension": "json"}
    await axios.post('https://oauth.reddit.com/api/subscribe', Headers, Params, Body)
    .then((response) => {
      console.log('sub: ' + JSON.stringify(response.data));
      console.log("Subbed to " + sub)
    })
  } catch (error) {
    throw 'Could not sub: ' + error
  }
},

Here is the Catch result:

"Could not sub: Error: Request failed with status code 403"

here is the official api about subscribe : https://www.reddit.com/dev/api/#POST_api_subscribe

action = "sub" and sr = "t5_2qh03" and I tried sr_name and sr but none seems to work, I'm sure the token is valid since it works with other GET requets I can't find what I did wrong here. Do you guys have any idea on what I'm missing ?

Edit: I've tried the same request with postman and the request actually worked, i did sub to a subreddit, but the same exact request is not working with axios, does my request is okay ?