I have 2 other friends who share this world and none of us have been able to access it for quite a while now. The world in question is #3. Everything else I can access without issue. We've got a significant amount of time and effort into this world and I'd hate for everyone to lose what they've built.
#My Lego World gives me the "Network Connection Lost" alert.
winged steeple
stray depot
I have this same issue going on.
balmy linden
This bug may be fixed on the next update (this friday).
exotic raven
I believe they said they were gonna fix it in your report, doll?
Fingers crossed for everybody. This is a gamebreaker.
earnest shore
When I get this error, I log in via my Switch and move myself to a new location. Once I do that and go back to lobby. Then log off. Go back to my original platform to play and it'll let me on. If you have this ability, give it a shot