I’ve had this happen when I have returned to the Fortnite lobby and changed from UEFN Session to something else. There doesn’t seem to be an option to get it back again and launching a session in the editor doesn’t work. The session will launch with UEFN connected, but there is no way to connect to the server from Fortnite.
The only reliable thing I’ve found is exiting the session in UEFN, closing Fortnite, and waiting a few moments before launching a session again in UEFN and waiting for Fortnite to reopen by itself. Be sure to wait a little after closing Fortnite, because sometimes Fortnite will not open if you launch a session too soon.
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