How to get auth token for PowerBI REST API? - node.js

Question

I am in the process of building a server-side app that is going to push the data into PowerBI's dataset. The only thing I'm struggling with is getting the bearer token to make a request to their API.
I'm getting the access token in the following way, however, I'm getting "401 Unauthorized" when using it in the request.
async getToken() {
const AuthenticationContext = adal.AuthenticationContext;
const context = new AuthenticationContext(`${ CONFIG.power_bi.authorityURI }/${ CONFIG.power_bi.tenantID }`);
return new Promise((resolve, reject) => {
context.acquireTokenWithClientCredentials(
CONFIG.power_bi.scope,
CONFIG.power_bi.clientID,
CONFIG.power_bi.clientSecret,
(error, tokenResponse) => {
if (error) {
console.log('PowerBI Token Acquire Error:', error);
return reject(tokenResponse == null ? error : tokenResponse);
}
console.log('PowerBI Token Acquired:', tokenResponse);
return resolve(tokenResponse);
}
);
});
}
async postRowsInDatasetTable() {
const token = await this.getToken().then(({ accessToken }) => accessToken);
const groupId = '{groupId}';
const datasetId = '{datasetId}';
const tableName = '{tableName}';
try {
const result = await axios.post(
`https://api.powerbi.com/v1.0/myorg/groups/${groupId}/datasets/${datasetId}/tables/${tableName}/rows`,
{
rows: [{
"status": "Deal",
"date": "2021-02-10T10:55:01.706Z"
}]
},
{
headers: {
'Authorization': `Bearer ${token}`,
'Content-type': 'application/json'
}
}
);
} catch (error) {
console.log(error);
}
}
The thing is that data push functionality is working just fine with a token which I took from PowerBI's documentation page, where they provide example API calls, as it is populated automatically based on currently logged-in user (e.g. https://learn.microsoft.com/en-us/rest/api/power-bi/pushdatasets/datasets_postrowsingroup), which means I am simply getting the wrong token.
Could anyone please advise how to get the appropriate token, as I found nothing in the documentation?
Thanks