Hi @Daniela Rothschild Rodriguez
You can try installing Mendeley Plugin in MS word through Mendeley Desktop (as seen in the video below).
https://www.youtube.com/watch?v=YjJnqtMAkC0
You can also try reaching out to Mendeley support at https://service.elsevier.com/app/home/supporthub/mendeley/
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If this is helpful please accept answer.