Final answer:
The error message about an authentication protocol suggests a need to update the application, in this case, OneNote, to address compatibility issues with server authentication protocols.
Step-by-step explanation:
The message you are seeing suggests there is a problem with the authentication protocol used by the server you are trying to access. This is usually something that needs to be addressed by the server administrator. However, as an end-user, if you encounter this problem with an application like OneNote, you should first check for updates, as an outdated version of the software might be causing the issue. Therefore, the most applicable step you can take is to Update OneNote to ensure compatibility with current authentication protocols. Checking network settings may help if you are experiencing general connectivity issues, but it is unlikely to resolve an unsupported protocol error. Using a different server or ignoring the message is not advisable as it doesn't solve the underlying problem and could pose security risks.