I have a multi-tenant app. Every time a user registers, a site is created in the subdomain. Lets say the site is https://example.com. When a user registers with the username foo, https://foo.example.com gets created.
Initially I thought I could have a sitemap at https://example.com/sitemap-users.xml which will contain all the sitemaps of all subdomains. But looks like this is not possible because subdomains are completely different website from domains.
I have close to 3k+ subdomains, so a better approach for me is to submit it programatically. How can I do that?
And if this is not possible, how do other websites achieve this?