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I have exactly the same problem, which is even worse in Disney+ for 4K HDR content. My Apple TV purchases in HD are fine but 4K HDR is also dark. For some reason the moderators seem to stay away from discussions about the HDR being dark and I can't seem to get hold of them via the chat feature!
I had the exact same issue with the TU7100 I just bought. The only work around I found was to set your AppleTV to SDR output not HDR then the movie is watchable but is still a little on the dark side. Samsung should address this issue with with a firmware fix. I previously had an LG screens that worked perfectly with HDR and was never too dark.
Very disappointing really as I cannot adjust the brightness up enough to make HDR watchable, so much for Samsung Marketing!
I had exactly the same issue. You need to download the firmware from the website and copy it to a USB stick and insert that into your TV. I’m sure there’s details on the support site as to how to do it.