www.makemkv.com

Looks like there may be discs out there with different AACS files. Mine is "MKB20_v77_MARVEL_STUDIOS'_THE_FANTASTIC_FOUR-_FIRST_STEPS_-_ULTRA_HD_7698.tgz" whereas the one submitted ends in FA04. Not sure if that makes a difference, but I can't currently rip mine and I just added the newest...

AACS dump submitted and I've also posted the file to Public KeyDB Disc Submissions

Lights Out 4K UHD US MOD release dump linked here:
https://drive.google.com/file/d/1xrvl0B ... sp=sharing

AACS dump also linked in the Public KeyDB Disc Submissions thread

AACS dump for Night of the Living Dead (1990) 4K UHD [Columbia Pictures Steelbook]
https://drive.google.com/file/d/12LJjrr ... sp=sharing

also submitted to the Public KeyDB Disc Submissions post.

Submitting dump file for Arrow Video's 4K UHD release of Poseidon (2006)
https://drive.google.com/file/d/1Iqkaeq ... sp=sharing

just sent over MKB20_v82_VSU012UHD_6E3C.tgz
Should be noted that this is the "fixed" disc that was shipped with my copy. Apparently the original has an error of some kind.

New to submitting so let me know if there's anything additional I can do to help.