How to Reliably Find a Company's Domain Name by Location

GM! How would you very reliably find the domain (e.g. sap.com) from a company name I tried the following prompt but is not really delivering

Inputs:
- Company Name: /Firma
- Country: /Land

Instructions:
1. Search online for the company's official website.
2. Check that:
   - The website is active (no 404, no error, no redirect to unrelated pages)
   - The domain name clearly matches the company
   - The domain ends with the correct top-level domain (TLD) for the given country:
     - Deutschland → .de
     - Österreich → .at
     - Schweiz → .ch

Output format:
- Return only the domain (e.g. firma-muster.de)
- Do NOT include http://, https://, or www.
- Do NOT include any extra text or explanation
- If no valid domain is found, return exactly: Not found

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