The current x64 version of WS Pro doesn't seem to be able to use the ArcEngine / ArcGIS Desktop functionality, in contrast to previous x32 bit versions? Since only x64 bit version is now supported, this feature cannot be used.
It is one of the most important features when rendering background basemaps / aerials, with many organisations using ArcGIS Servers to publish open data.
The current work around for WMS layers are not quick and provide a difficult interim process to manage, particularly for basemaps.
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We understand this is an important capability and have incorporated it into our roadmap.