hi @MIguelFaro ,
There were a lot of Nintendo problems a while ago.
This thread probably sums this up.
Nintendo Switch PLayers / Mobile: Crash Game / Fortnite Closes when trying to play on a public published map / Fortnite Creative )
Recently there has been a problem with Public versions crashing and after a lot of investigation.
This was due to Xbox One not updating and having to be first uninstalled then reloaded.
The problem is that the MS Store on using the Fortnite update function does NOT deliver updated code.
Just now on Nintendo. Turned on and tried to use version UEFN 31.40 connecting to Nintendo and crashed just like you described.
Checking the version Nintendo was using is 31.20
Rather surprised to find that my finger had hit a default selected box “Decline”, so the update was not done, leaving FN at 31.20.
Powered off and started again, and got messages about adding SD memory cards.
Finally got the complete reload into Nintendo and this all works properly.
Like many times before CONSOLES DONT UPDATE, you need to uninstall/delete and reinstall from the relevant supplier store
The private code does not match the Public Servers. private code can be any version and Nintendo has extended functions to allow the local running of earlier versions of FN games.
There is no way to check in UEFN of FN Creative for the correct matching versions because this is only needed and relevant for development.