Platform-exclusive items such as the Xbox Jade items, Nintendo Switch Opal items, Amethyst Skins from Discord will NOT transfer to PlayStation during the One-Time Account Merge. In addition, PC exclusives such as the Phased Skins, Rubedo Skins, IAHGames Braton Skin and Rixty MOL skin will not be available on PlayStation.
Conversely, the PlayStation-exclusive Obsidian Skins will NOT be available to use on platforms other than PlayStation.
Excalibur Prime, Skana Prime and Lato Prime will be locked to PC.
If im getting it right you merged your old pc acc that had excal Pr, and merged that with your playstation acc?
I think you are out of luck, but you could always try submitting a support ticket.