Please contact the Scopus Support page to get help with this. Scopus, in particular, requests the user to login to an Elsevier account when the user attempts to login to Mendeley. This may complicate exporting citations from their databases directly to Mendeley Web.
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You should be aware of the following shortcomings: While Mendeley (particularly the desktop application) is quite good as a reference management system, it does have its limitations.