Microsoft Graph API Unauthorized Error 401 - microsoft-graph-api

Question

I am new to MS graph api. I am learning this API and I followed this tutorial https://learn.microsoft.com/en-us/azure/active-directory/develop/tutorial-v2-nodejs-console and it works fine for me when retrieving the user. here is the code
async function main() {
try {
// here we get an access token
const authResponse = await auth.getToken(auth.tokenRequest);
console.log("get auth reespones ", authResponse)
const options = {
method: 'get',
headers: {
Authorization: `Bearer ${authResponse}`
}
};
// call the web API with the access token
const users = await fetch.callApi(auth.apiConfig.uri, options);
console.log("get users ", users)
} catch (error) {
console.log("error here",error);
}
};
But I am trying to call other API and I have a problem accessing the calendar API.
here is the new function I use to call the calendar api in ms graph.
async function getcalendar() {
try {
// here we get an access token
const authResponse = await auth.getToken(auth.tokenRequest);
const options = {
method: 'get',
headers: {
Authorization: `Bearer ${authResponse}`,
Prefer: `outlook.timezone="Pacific Standard Time"`
}
}
// call the web API with the access token
const users = await fetch.callApi('https://graph.microsoft.com/v1.0/me/calendar', options);
console.log("get users ", users)
} catch (error) {
console.log("error is here ",error);
}
};
in my application in azure I already set all the permissions
I have no idea why it keeps saying unauthorized.
Any help is appreciated. Thank you

Answer 1

Try to set Calendars.Read, Calendars.ReadWrite for Delegated permission type instead of Application type.
getSchedule api doesn't support personal Microsoft account.

Answer 2

You cannot use personal accounts to hit the me/calendar/getschedule because this is not supported.
The permissions works only for work or school accounts or with App token.
As you are using Application context you need to make the call something like below.
/users/{id|userPrincipalName}/calendar/getSchedule as there is no meaning for me if there is no user involved.