Oh! That was it then. It was having problems because I was trying to install it while the game was still on my phone. I thought I just needed to uninstall the game and that I could save the file for it to download faster later. But apparently this was giving me an error on my phone, I managed to resolve it after completely deleting the game, I did the installation again and downloaded the game back, now it works without any problems 👌
There was no problem with installing the DLC, it was just my mistake. My apologies 😅
Anyway, thanks for the help 💓✨