1st vaccine, Astra Zeneca, in Ecuador, 2nd vaccine, Pfizer, in USA?

Has anyone returned to Ecuador after receiving their 1st Covid 19 vaccine of Astra Zeneca in Ecuador and their 2nd vaccine of Pfizer in the USA?

The mixing of 2 different vaccines is relatively new and many countries allow this (such as Canada) but USA and Ecuador have not approved it yet — to my knowledge.

I am wondering if you had any problems reentering with 2 different vaccine certificates that both say 1st dose?

Thank you for your help.

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