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Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
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Hi,
According to the following official documentations , Basic authentication is no longer supported for EWS to connect to Exchange online. To continue to connect and interact with Exchange Online using EWS, developers need write their applications to support OAuth 2.0 – also known as modern authentication.
Authentication and EWS in Exchange | Microsoft Learn
Deprecation of Basic authentication in Exchange Online | Microsoft Learn
You can refer to the following documentation to use OAuth authentication for your EWS application.
Authenticate an EWS application by using OAuth | Microsoft Learn
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