What is the most likely cause of the security error users encountered after a new browser version deployment?

The most likely cause of the security error encountered by users after a new browser version deployment is related to obsolete security technologies implemented on the SaaS servers. As browser versions update, they often enforce stricter security protocols and practices. If the SaaS servers are using outdated security technologies, such as older encryption methods or deprecated protocols, the new browser may reject connections to those servers based on their security policies.

When browsers update, they tend to enhance security measures for a better user experience, often rendering older technologies incompatible. This can lead to security errors when users attempt to access applications that rely on those older technologies. It's essential for SaaS providers to stay updated with current security standards to ensure seamless user access across all browsers.

The other options, while related to security, do not directly align with the context of a browser update causing immediate access issues. SSL certificate expiration would typically prevent access entirely rather than just trigger a security error in the browser. Federation issues would involve authentication or authorization problems rather than a direct security error initiated by browser updates. Unencrypted communications would typically be flagged in the browser but would not singularly account for security errors arising from new browser versions. Therefore, the most plausible explanation for these errors is the use of obsolete security technologies on the Saa