Hi,
It originally failed returning any result while importing new articles in the database. I then tried using the get bibtex info from the entry itself which did not return any results. Using a new entry returns “Fetcher doi did not find an entry for id ‘10.1016/j.enpol.2019.03.001’”.
In general, it does not find any bibtex info on all recent articles that I am uploading in my database (all referenced in crossref so I can find them all online). But looking at some older articles I have, the bibtex info are extracted from crossref. I am not sure what can it be related to.