New user here: Why does my community not show up in other instances?

I recently made a community, !celeste@lemmy.ca. The community can be seen from this instance, but isn't accessible from other ones.

For example, if I go to https://lemmy.one/c/celeste@lemmy.ca , I get an error.

Is there some requirement communities have to reach before they appear on other instances? Is this a bug?

Sorry if the answer is obvious or has been asked before, but I couldn't find any info on this.