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The "ERRSSLPINNEDKEYNOTINCERT_CHAIN" error signifies that the SSL certificate chain provided by the server during the Twitter OAuth login process is missing the public key required to verify the SSL pinning. This can happen if the server's SSL certificate has been altered or if a proxy server is interfering with the certificate verification process. This error can also occur if the client (browser or application) is trying to connect to a different server than the one specified in the SSL certificate.