Publishing old creative maps and analytics issues?

I have a lot of old creative maps from before UEFN that are in my creator portal now but show as “unpublished”, do I need to republish them in order for them to be playable? Will the old codes still work or will this give me a new code? Are the maps monetizable if they aren’t published through the new portal?

I’m also not able to see any statistics for my maps when I go to the insights in the creator portal, is this an issue for anyone else?