I'm having zero success all of a sudden trying to make panoramas with Camera RAW. Nothing has changed as far as types of panoramas I'm making. I get Fail to merge everytime. I perfer to use Camera RAW versus photoshop as I want to keep it in DNG.
Try resetting the Camera Raw preferences:
Hold down the Command key and select Photoshop > Preferences > Camera Raw (macOS) or hold down the Ctrl key and select Edit > Preferences > Camera Raw (Windows).
Click Yes in the dialog that asks "Delete the Camera Raw Preferences?"
Which Projection is selected, and does it fail for all projections?
Yes it did fail for all projections...the issue was solved resetting the Camera Raw preferences. Hope I remmeber that.