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When the security level is set to None, Opc.Ua may not be able to provide any security for the endpoint. In this case, the user identity type provided may not be supported by the endpoint. Opc.Ua may simply ignore the user identity type and allow any user to access the endpoint. However, it is important to note that this may compromise the security of the endpoint if sensitive information is being exchanged.

To handle this issue, Opc.Ua may provide a warning message to the user indicating that the user identity type provided is not supported by the endpoint when the security level is set to None. The warning message may advise the user to adjust the security settings to a higher level or use a different user identity type that is supported by the endpoint. Additionally, Opc.Ua may provide guidelines or best practices for configuring security settings to ensure the security of the endpoint.