Load vbucks

you purchased vbucks via epic on pc, then you need to load fortnite on pc to add them, to get vbucks on xbox you have to purchase via microsoft store or in game on xbox

if I load on xbox once, will I be able to use the skin and vbucks on pc?

no, it will add the vbucks to your microsoft account, to then ync them to your epic account you would need to load fortnite on xbox console or free via the cloud then the vbuck will appear on your epic account.

i had the same issue it says i bought the vbucks but doesnt load onto my fortnite account

vbucks are added to the account that purchased them via xbox, this will sync to your epic account once you load fortnite up on console.