Hi Alain,
Thank you for reaching out. Expanded text ads do not use url, displayUrl, finalAppUrls, or devicePreference and setting these fields on an expanded text ad will cause an error. This also means that you are not able to fetch these fields for an expanded text ad through the API. Please refer to this documentation for more information.
Thanks and regards,
Xiaoming, Google Ads API Team
Hi Alain,
Thank you for reaching out. It would be great if you found that "CreativeFinalUrls" works. For the Responsive Display Ad you could refer to this blog post for more information.
Thanks and regards,
Xiaoming, Google Ads API Team