The birth certificate is from Ecuador. The following messages are NVC response to the rejection.
April 25
"This document is missing the Legalized Sticker of the Civil Registry on the back. Please replace this with a scan that shows the complete text of the document, including all seals and stickers. Please ensure all sides of every page are scanned and visible. Please visit https://nvc.state.gov/scan for further guidance."
May 9th
Please replace this with an acceptable birth certificate from a correct issuing authority. Please use our Document Finder at https://nvc.state.gov/find for acceptable documents guidelines.
The birth certificate has all the identifying factors listed on this website. https://travel.state.gov/content/travel/en/us-visas/Visa-Reciprocity-and-Civil-Documents-by-Country/Ecuador.html
Certification is on the back of the document and on top of that, the document is apostille.