Eureka! Found the solution.
I just read all the other comments and someone said to enable the "Sensor Service". Well that was it. I had disabled that service after someone had mentioned it was safe to disable in some post to optimise windows.
I enabled it and now the power settings page is opening.
Task Manager -> Services -> Open Services -> "Sensor Service" (Make startup -> "Automatic")
Thanks to whoever mentioned about the Sensor service in the comments earlier.