In the situation where a DLC cannot be accessed or appears locked, please use the 'Restore Licences' option via the 'Account Management' section of the PS4.
Full instructions and other solutions can be seen on the PS4 Support website: https://support.playstation.com/s/article/PS4-Trouble-With-Downloadable-Content?language=en_US
[PS4] DLCs Can't Be Accessed, or Appear Locked?
