T4i, Rebel, Kiss etc are regional. Adobe use global model numbers so 600D, 650D etc. It's the 'UniqueCameraModel' tag that calls profiles in ACR so make sure this tag is the correct one for your camera in your DNG meta. If not, contact the raw2dng's app dev. If the tag is correct it is 100% going to be due to the location of the .dcp. Make sure you have the latest CameraRaw installed or if you are on an earlier CS version, the last available CameraRaw released for that. Also, there is one unmentionable app out there that doesn't follow procedure and embeds non-standard tags making any standard camera profile inaccessible.