Hello,
Thank you for contacting the support and sorry for any inconvenience that might have been caused due to that.
After checking the URL (https://www.decorate-it.be/geschenkset/), I can see it’s set to “noindex”.

Also, I see that the URL has no products. While some of the categories are which has products and set as index. So, please make sure you’ve toggled OFF the option “Noindex Empty Category and Tag Archives” in Rank Math > Titles & Meta > Global Meta

Let us know how it goes.
Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.