在应用程序中，可以使用 Microsoft Graph API 来检查用户是否是首次登录。然后，如果是首次登录，则向管理员发送批准请求，以便让用户完成登录。

以下是一个示例代码，该代码使用 Microsoft Graph API 来检查用户是否是首次登录。如果是，它会发送一个邮件给管理员，以便让他们批准该用户的登录请求：

//检查用户是否首次登录
function checkFirstTimeLogin(user) {
    return new Promise(async (resolve, reject) => {
        try {
            const endpoint = `https://graph.microsoft.com/v1.0/users/${user.email}/activity/feed?filter=activityType eq 'signin'`;
            const res = await fetch(endpoint, {
                headers: {
                    Authorization: "Bearer " + authProvider.getAccessToken(),
                    "Content-Type": "application/json"
                }
            });
            const data = await res.json();

            if (data && data.value && data.value.length && data.value[0].status === "success" && data.value[0].approximateSignInDateTime) {
                const lastSigninTime = new Date(data.value[0].approximateSignInDateTime);
                const currentTime = new Date();
                const timeDiff = Math.abs(currentTime.getTime() - lastSigninTime.getTime());
                const diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));

                if (diffDays <= 1) {
                    resolve(true);
                }
            }
            resolve(false);
        } catch (e) {
            reject(e);
        }
    })
}

// 发送邮件给管理员以便批准
function sendApprovalEmail(user) {
    const email = {
        message: {
            subject: `Require admin approval for ${user.email} to login`,
            toRecipients: [
                {
                    emailAddress: {
                        address: ""
                    }
                }
            ],
            body: {
                content: `
                    Hi, 

                    Please approve ${user.email} to login to the SPA application.

                    Thanks,
                    
                `,
                contentType: "text"
            }
        },
        saveToSentItems: true
    };

    return new Promise(async (resolve, reject) => {
        try {
            await graphClient.api("/users//sendMail").post(email);
            resolve(true)
        } catch (e) {
            reject(e);
        }
    })
}

//登录检查，如果是首次登录则发送批准邮件给管理员
async function loginCheck(user) {