We have a group of 3 domains which together covers different countries and languages. They each have a hreflang sitemap and the variants live across the domains. As a result, if the site audit only look at the sitemap on 1 domain, it will report "missing reciprocal hreflang tag" on all the urls.

It would be good to have the ability to provide the sitemap url of the other domains, and when the audit is done, it would look at all the sitemaps as a group and report on real issues.