Hi!
It looks like Google Search Console can’t read one of the sitemaps. The main sitemap sitemap.xml (https://forum.pragmaticentrepreneurs.com/sitemap.xml) is read correctly, but only sitemap_recent.xml is imported.
If I try to add sitemap_1.xml by myself to Google Search Console, I get an error. If I try it in the validator, it looks good.
Do you have any idea why GSE can’t read sitemap_1.xml?
Thanks for the help.
EDIT:
Bing is reading both sitemaps correctly, so it looks specific to Google.
Also, everything is fine with I try to inspect sitemap_1.xml
It looks like you had the same issue last year: Troubleshooting sitemap indexing issues in Google Search Console.
Did it eventually work?
Just saw I already posted a question about this 
But no I didn’t get a solution.
Let me know if I can give more info to help.
I have no idea, either.
The URL is accessible to me. I tried various tools to validate the XML, no issue. Reading Manage your sitemaps using the Sitemaps report - Search Console Help, you should see a detail page below the error that tells you what’s wrong (doesn’t look like the case for you, though).
At the very least, I would encourage you to read this article. You might find a clue.
Indeed, I’ve no detail about the error. I tried to inspect the URL as they said, but not error here 
Let me know if I can do something else to help.
Update
I found the correct sitemap endpoint and it’s behaving normally for Googlebot:
https://forum.pragmaticentrepreneurs.com/sitemap.xml
It’s a valid sitemap index and it references:
https://forum.pragmaticentrepreneurs.com/sitemap_recent.xmlhttps://forum.pragmaticentrepreneurs.com/sitemap_1.xml
What I tested
- Googlebot access:
sitemap.xml, sitemap_recent.xml, and sitemap_1.xml all return HTTP/2 200 with a Googlebot user-agent, and the body is real XML (not an HTML challenge page).
- Headers / content type:
sitemap.xml: Content-Type: application/xml; charset=utf-8sitemap_recent.xml + sitemap_1.xml: Content-Type: text/xml; charset=utf-8- Responses include
x-discourse-route: sitemap/* and x-discourse-crawler-view: true (served by Discourse in crawler mode).
- IPv4 + IPv6: both return 200 on
sitemap.xml.
- Stability: I fetched each sitemap 20 times in a row with a Googlebot UA — no 403/429/5xx.
- Typical response times were ~0.17–0.28s for
sitemap.xml, ~0.19–0.60s for sitemap_recent.xml, and mostly ~0.45–0.99s for sitemap_1.xml (one slower response at ~2.9s, still 200).
- robots.txt: includes
Sitemap: https://forum.pragmaticentrepreneurs.com/sitemap.xml and doesn’t block /sitemap*.xml.
Search Console status
In Google Search Console, the sitemap index processing shows as successful, but only
https://forum.pragmaticentrepreneurs.com/sitemap_recent.xml is currently listed/recognized under “Sitemaps read”.
sitemap_1.xml is still not listed there.
Where this leaves things
From the server side everything looks fine, so this feels like a Search Console-side lag or partial processing: Google is reading the index and at least one child sitemap, but hasn’t surfaced the second one yet in the UI.
