Error Code 0203-0003
No confirmed fix yet. Players suggest: Second attempt worked for me.

4 fixes · 3 how-to answers · Steam discussions
No confirmed fix yet. Players suggest: Second attempt worked for me.
No confirmed fix yet. Players suggest: Sometimes I can host just fine, sometimes I'll try 30+ times and it won't work at all.
No confirmed fix yet. Players suggest: I think this is a known issue that is planned to be fixed soon.
No confirmed fix yet. Players suggest: Which is not how I understand that phrase works
This guide will provide a detailed breakdown of all minifigures in LEGO® Party!.
Codes to unlock secret Minifigures
This is your ultimate cheat sheet for unlocking the secret Skeleton Guy and Arkade Minifigures in LEGO Party. We’ve got the codes and the critical steps you need to follow to add these fire characters to your collection.