Google Index - Crawled but not Indexed for Subdomain and Maindomain!

Hello,

we have 2 domains. Our https://stage.walanco.de/ (storefron is closed) and https://walanco.de/ - Stage was unintentionally crawled. But as far as I understand will Google index both individually?!

We added our sitemap to Google Search Console 2 weeks ago but so far only stage urls have been indexed.

Anyone has an idea why this is not happening? Is there a walkthrough on how to index one but not the other?

https://walanco.de/sitemap.xml