Re: bf1 premium not installed
If it is installed correctly, when you open the game next, it should say "Premium Pass" under the Battlefield 1 title on the Home Screen of the game.
You should also be able to see that you have access to the DLC Maps in the Multiplayer Quickmatch Menu.
If it is not there, try Restoring your licenses in the PS4 Settings, and see if that works.
Also, do a hard reset (unplug your PS4 power supply) for a couple minutes, and plug it back in.
Try this out, and let me know if you see that it has been installed.
Thanks 🙂