Is it possible to publish an erratum in another journal? If an author published a paper that contains errors and decides to publish an erratum, but the journal where the article was published is inactive (but its website still exists). Could the author publish the erratum in another journal?
If so, what could the author do to make the article indicate the existence of the erratum?
What can be published in a journal is up to the editors. If the original was sufficiently important and the errors less than obvious to readers, then an editor might consider it. But they would rather, I surmise, publish a full paper with correct results, citing the old, than just an errata. If you can't make the new work seem significant, I doubt that editors would be interested.
But the editor decides, perhaps with advice from reviewers. You can possibly make a proposal to an editor before spending wasted effort.