This is a reminder that Microsoft 365 Apps are disabling server sign-in prompts using Basic authentication in Office Apps (originally communicated in MC454810, November ’22). We are making this change because basic authentication is a legacy authentication method that sends a username and password with each request. As a result, an attacker can access these credentials and use them to access resources. Continued use of Basic Authentication is a big security concern, so we have decided to deprecate it from all tenants.
We will retire this feature in Office Apps version 2301+. Instead, we recommend moving to a more secure authentication method, preferably Modern Authentication, and enabling multi-factor authentication based on OAuth2.0 token-based auth.
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Originally posted by Microsoft
Jan 19, 2023
Microsoft 365 Apps
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