Sony A9II Adobe camera raw not yet updated

You can use the Adobe Dng Converter 12.1 Beta until Camera Raw gets updated to convert the A9 II files to dng copies which should the open in Camera Raw.

mac

https://supportdownloads.adobe.com/detail.jsp?ftpID=6791

windows

https://supportdownloads.adobe.com/detail.jsp?ftpID=6793

The problem is that people buy new cameras when they come out, not when the software supports them. Depending on the camera realease date and the Adobe software release date, it may well be that the camera just came out, when developpers froze the camera support for that release. 

Generally Adobe is quite quick with new cameras especially when the changes in the file format are only minor. But still it takes at least one update to get support.

Sometimes you can patch the file header to impose the wrong camera model and when the difference of the file formats are only minor, it may well be that the software decodes then the files.

Adobe have to buy the camera and do a lot of work. 3-6 months is my guess, but Adobe won’t say.