The sitemaps have been added to search console for a week now.
Google seems to be crawling multiple pages without any errors, but looking at site:mage.town - Google Search shows that so far it’s only indexing the standard sitemap and none of the dynamic pages. Even indexing requests of individual URLs don’t seem to work (Search console says it’s complete without errors, but none are indexed).
How long has it been since you have submitted your site? I don’t have any secondary sitemap for the dynamic content but I do have those pages indexed and also ranked in some cases. Google takes its time to index new sites. Maybe give it a few days.
Also, I am not sure if the format or syntax for the second sitemap is correct. I have not done it, so not sure. Might be worthwhile to double check that - but otherwise just give it some time.