Camera Raw is not an app you can open. Is is a plug-in that is accessible from Photoshop and Photoshop Elements. When you are in Lightroom and send an image to Photoshop, Camera Raw does not open. Camera Raw is used to convert images as they are sent to Photoshop. Are the images that you are looking at raw images? If the images are JPEG images you won't see choices such as Vivid, Camera Standard, etc. All you will see is Embedded.
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We have identified this issue as a bug, refer Lightroom: Edit in Photoshop warning message since update | Photoshop Family Customer Community you can refer the workaround for now: Erroneous compatibility warning with Edit In Photoshop
Thanks for your patience with us.