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First, You need to set up the Microsoft Graph API configurations, You have to create a Free Microsoft 365 Developer Tenant account from here to register your Azure account to get the tenant ID which is later required to send the email. After creating the account, copy the email address to use it to sign up to Azure.
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Figure 1: Create A Free Microsoft 365 Developer Tenant Account Subscription
Create Azure Account
Upon creating Microsoft 365 Developer Tenant account, sign up on Azure here using your given Microsoft 365 Developer Tenant email address in the previous step.
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Next up is to get your client secret.
To do thisgenerate a new client secret, from the app's overview page, go to Certificates and Secrets > New Client Secret and enter a description and expiry date for the client secret:
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