Playing Blu-Ray discs in windows 10 is a bit og a pain.  In order to get it to work you have to go through a few hoops with VLC.

https://vlc-bluray.whoknowsmy.name/

Part A: Keys database

Create the folder “C:\ProgramData\aacs\”

Download keys.cfg from the link and place in the folder you created “C:\ProgramData\aacs\”

Note:
finding keysdb.cfg file isnt available at that site for some reason anymore.

Part B: AACS dynamic library

Depending on the version of VLC you have you just need to copy this dll file into the same directory.

VLC 32 bit on Windows: put that file in your VLC directory
VLC 64 bit on Windows: put that file in your VLC directory