[2021] Issues syncing my account on PS4

This requires some backstory before I state my problem. In 2018 I downloaded fortnite on my moms PlayStation for a SINGLE DAY. I signed in as guest and didn’t make an actual epic account. After playing for a single day I deleted the game completely from the PS4. Current day I got my own PS4 but my moms is connected to it via the Parent account. I have the game on my brothers Xbox and wanted to play on my PS4. Since I’m not always at my brothers house. I tried to sign in using my epic account I created afterwards for the Xbox. But it says “this PS4 has an account already connected to it” or something. But there is no account connected to my current PlayStation. I never had the game on it nor have I not opened it yet Only my moms. Who again, is the parent account to my PlayStation. When I try and log out of the account on the website it says “there is no fortnite account associated with this account” because.. there’s not.... but when I go into epic games.com to log into my PlayStation it says “you cannot log into the game because there’s already an account associated with it” ???? I asked this once like two seasons ago and Nobody understood this problem. It’s ONLY happening to me it seems and that’s very upsetting to me. I just want to be able to play this game without having to go an entire county over to my brothers house to play on my account. Is there any way I can get it signed into my current PlayStation at without any external sources? Like through the game itself? Would removing my mom as the parent account work? Can I even do that?