[Geschlossen] Translated page is not indexed

Background of the issue:
I have translated and published certain URLs to the NE language and set them to be indexed in YOAST SEO. The issue can be seen on this page: versteckter Link.

Symptoms:
Google could not find the URLs, and I checked in Google Search Console (GSC) where crawlers cannot find it.

Questions:
Why are my translated pages not being indexed by Google?
How can I ensure that my translated pages are crawlable by Google?