Buy box for new seller?

Hello everyone,

I am a new seller on Amazon in Europe, my products arrived at the Amazon warehouse in Germany yesterday and have started to be stocked. However, none of my products have the Buy Box button. What could be the reason for this? It's a really frustrating situation.

I want to highlight that I am the creator of the listings and the owner of the brand. Additionally, I want to specify that there are no other sellers on these listings besides me. I have been successfully selling on the American market for years.

Thank you in advance for your help.