The 80d is supported by Lightroom 6.5 as the earliest. So you need to upgrade to LR 6 or LR CC to get native support within Lightroom. You can also download the free DNG converter from Adobe and convert your 80D raw files to dng. Those will work in Lightroom 4.
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As Jao points out, you need a software update to 6.5 or newer.
Because you are using really old software, one question that is going to come up is whether or not your computer can run the current version of Lightroom. For Windows, you need to make sure you are using a 64-bit OS. For Macs, it is a bit more complicated.
Hey. I have the same problem. Except I have only just subscribed to the CC Photographer's package, so my version of Lightroom is the current one - at least, it tells me that it is - 2015.8, with Camera Raw 9.8.
Lightroom refuses to recognise my .CR2 files, although Bridge, Camera RAW, and Photoshop are all perfectly happy with them.
What's going on?
Can you post an offending .cr2 file somewhere so we can examine?
I downloaded the free DNG converter and that solved the problem-the files can now be processed in Lightroom 4 but the better solution is to upgrade Lightroom because there have been many improvements. I just thought that a CR2 file was universal so was surprised when I could process files from the Canon 60D, but CR2 files from the 80D could not be recognized. Thank you for the information--at least now I can back to processing.