

Apps don’t store or use user credentials, and authentication is based on time-limited tokens.

This authentication type doesn’t support MFA (Multifactor Authentication) and is not robust against brute-force attacks. Basic auth is performed through a simple Windows Security window that prompts for a credential (username and password) and prompts you to save your password to the Windows Credential Manager. Basic Authentication – this type of authentication is familiar to all Windows users.Microsoft currently supports the following types of authentication for Office 365 (Microsoft 365): How to Enable Modern Authentication for Microsoft 365 Tenant?.Basic Authentication Sign-in Log in Azure AD.
