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For a 2014 T2 there are two possibilities for a file showing eligible not filing:
1) If you receive a failed message with a read X, this means the file failed to build. The auditor must be checked for messages preventing filing. Look in the auditor under the summary and RSI tabs. These tabs may contain messages that prevent filing.
2) The Canada Revenue Agency, (CRA) rejected the file. CRA will give a message stating why the file was rejected. These errors must be corrected. CRA can be consulted if you need details for the error
Hope this helps