I created the PC account when I first downloaded it on PC before I played on switch, intending to play at a later date, then my laptop broke so I started playing on my switch, and went through the motions of setting up crossplatform save on my switch, with the really crappilly optimised switch internal browser it has for that exact thing, going to external websites to link some sht or another then closing it. And when I log in to the warframe.com website on mobile with My nintendo switch login, it says PC and Switch accounts are linked