As of today, December 1st (2021), Ecuador is requiring travelers to show proof of being fully vaccinated against covid in order to enter the country.
Additionally, a negative PCR covid test is required 72 hours or fewer before arrival.
The new rules were announced by Presidente Lasso and appear in an article titled "Lasso announces new precautions..." at the Cuenca Highlife website. Some new rules affect the capacity levels at certain businesses and require proof of vaccination to enter certain buildings.
The rules are precautions against the potential effects of omicron/covid if its presence is discerned in Ecuador. Flights from some African countries will not be permitted into Ecuador under the new rules.
Sources... www.cuencahighlife.com and
the Mr. Second Passport channel on YouTube.com