The 6D II was first supported with Camera Raw 9.12 released July 2017:

Camera Raw 9.12 now available | Adobe Blog
Your mention of ACR 9.1.1 suggests the use of CS6 which stopped being updated with ACR 9.1.1 back in July 2015 and there are no new updates for new cameras or bugs or anything else.
Camera Raw 9.1.1 is now available
You can either upgrade to the current CC subscription-only versions of Photoshop CC and Camera Raw (currently 10.3) or you can use the free DNG Converter 9.12 or newer to create DNGs from your CR2 files and those DNGs but not the CR2s will open in the older software. The latest DNG Converter software is available on Adobe's updates page:
Adobe software and product updates
The CC Photography plan, currently the most cost effective way to get the current Photoshop, can be subscribed to, here:
Adobe Creative Cloud Photography plan | Professional photo editing software