Robust Authentication with Microsoft Graph API (Using MSAL and ...

… has built-in in-memory token caching. By initializing this object once and reusing it for subsequent token requests (within the lifetime of your function’s warm instance), you allow MSAL to serve tokens from its cache if they are still valid. This significantly reduces calls to Azure AD, improving performance and reducing the likelihood of being throttled. **Automatic Token Renewal**: MSAL handles the logic for checking token expiry and acquiring a new token when needed before the old one expires.