With the release of IBM Cognos Analytics 11.X, IBM has dropped support for the use of portlets (Portal Services), including support for SharePoint integration.
This can be confirmed by the fact that the Supported Environments for ICA 11.X no longer includes a “Portal Servers” section under “Supported Software”.
In addition, with ICA 11 has updated the Internet Explorer 11 rendering requirements to be IE=EDGE, which is not supported (without customization) by SharePoint 2010, 2013 or 2016 – see Understanding Cognos, Internet Explorer and SharePoint
QueryVision continues to update and support IBM Cognos 10.X and 11.X, which includes support for 11.0.9 (as of 16 Feb 2018) and is committed to supporting future versions as well