Hi @Betsa ,
Could you provide some screenshots about your configured Query Rule settings? Otherwise I can't know your situation.
Below is my test:

Confirm the information with you:
- What level are you setting up at? Is it done at the site or site collection or at the entire tenant level(in SharePoint admin center)?

- If you set query rules in SharePoint Admin Center,if you've only tested the main hub site and it doesn't work, are the other associated sites working for it? I'm asking this because query rules with promoted results are deprecated for organization scoped queries.
You can see a related case like this: SharePoint Search - Promoted results - Query rules - Make sure you have selected the appropriate search source.
eg.We usually use Local SharePoint Results as source, you can try to switch to Documents source.

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