Hi Reggie,
Thank you for reaching support. I tried running the below report query and was successfully able to get the asset.text_asset.text value for the TextAsset/AdTextAsset added on the responsive ads in my account. Also, I was successfully able to retrieve the resource name and asset Id of headlines and descriptions assets added upon creation of the responsive display ads. Attached the logs for your reference. If you are still facing the issue, could you please share the complete request and response logs for me to investigate further by enabling PHP logging? You could enable the PHP logging by following this guide for PHP client library. Please use Reply privately to author option while sharing the details.
"SELECT asset.name, asset.id, asset.resource_name, asset.type, asset.text_asset.text FROM asset WHERE asset.type = 'TEXT' LIMIT 100"
Regards,
Nikisha Patel, Google Ads API Team