There are several reasons why you may get this error. Some are listed below. Possible solutions are bolded:
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You used the wrong email OR tried a username rather than a full email address. Follow the instructions of the database.
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You are not using your Adelphi University email (@adelphi.edu or @mail.adelphi.edu). Follow the instructions of the database using your Adelphi University email
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You did not access a licensed resource. Try accessing through the libraries website (https://libraries.adelphi.edu/)