On August 13, 2021, on the single window portal, Mexico published Fact Sheet No. 23 announcing that as of August 16, 2021, the importer may use the phytosanitary certificates issued by the United States of America as part of the Mexico-United States Electronic Phytosanitary Certification Program.
More information on the program can be found online here:
https://www.ventanillaunica.gob.mx/vucem/index.html
Fact Sheet No. 23 can be found here: https://www.ventanillaunica.gob.mx/vucem/meses/agosto2021/Hoja%20Informativa%2023%20-%20Consulta%20de%20Certificados%20Fitosanitarios%20electronicos%20emitidos%20por%20EUA.pdf