Update member group through POST (axios)

[Capitão Jack]

Hello Team,

I'm trying to send a POST request through the endpoint using axios, so that I can update the member's group.
Flow for the code below: I call the function updateMemberGroup, which uses the function searchMember to get the member's id, and then I try to update the member's group on the endpoint api/core/members/${id}, as shown in the documentation:

https://invisioncommunity.com/developers/rest-api?endpoint=core/members/POSTitem

Please find below my code for that:

async function searchMember(email) {

    const url = communityUrl + 'api/core/members';

    let id = axios.get(url + `?email=${email}`, {
        headers: {
            'Content-Type': 'application/json',
            'User-Agent': 'MyUserAgent/1.0',
            'Authorization': `Basic ${Buffer.from(apiKey + ':').toString('base64')}`,
        },
    })
        .then(response => {
            let id = response.data.results[0].id
            return id
        })
        .catch(error => {
            console.error(error);
            return null
        });

    return id
}

async function updateMemberGroup(email) {
    let id = await searchMember(email);
    if (!id) {
        console.log("Member not found");
        return;
    }
    console.log(`Updating status for member with email ${email}`);
    console.log(`User ID: ${id}`);

    const url = communityUrl + `api/core/members/${id}`;

    let data = {
        "group": 9 // "Not paying" member
    };

    let resp = await axios.post(url, data, {
        headers: {
            'Content-Type': 'application/json',
            'User-Agent': 'MyUserAgent/1.0',
            'Authorization': `Basic ${Buffer.from(apiKey + ':').toString('base64')}`,
        },
    })
    .then(response => {
        console.log(`Updated Successfully ${email}`);
        return response.data;
    })
    .catch(error => {
        console.error(error);
        return "error";
    });

    return resp;
}

I don't run into any errors and tried several approaches, I get the 200 OK response in the API Logs, but the member is returning with the primaryGroup not changed (still as a member, and not the group I'm trying to assign):

{
    "id": 284,
    "name": "Kaue Nogueira",
    "title": null,
    "timeZone": "America\/Sao_Paulo",
    "formattedName": "Kaue Nogueira",
    "primaryGroup": {
        "id": 3,
        "name": "Members",
        "formattedName": "Members"
    }, ...
    

Further info:
- Access for the POST request is given in the API Key.
- I tried changing other parameters as test, without success as well, so I don't know if it's something with the POST request only on api/core/members/${id}(as I easily can add members through POST on api/core/members )    

Can you please help me on understanding this?