hi @Pokeasy
Epic support will need the UEFN full logs by dragging a copy to this thread
C:\Users\%USERNAME%\AppData\Local\UnrealEditorFortnite\Saved\Logs\UnrealEditorFortnite.log
just when the error occurred.
The other things to check is
Check and Allow Docker to use port 443** in Windows Firewall**
and then add 64GB Virtual Memory (pagefile,sys)