[2019] How does one get an Island Code?

I’ve been getting deep into making creative islands, and the first map I want to publish is the one I’ll be playing nonstop with randoms in Playground. I made a Nebula 1v1 island with selectable loadouts, and didn’t think about needing a code to get it out there for others to enjoy 😂 I really do like creating islands and look forward to all my other projects. (Hint at one: Dark souls untended Graves, Along with Gundyr fight) so, my question is how would I get an island code?