How do I use mongodump as I am getting the error, Failed: error creating intents to dump: error getting database names: (Unauthorized) command listDatabases requires authentication

I was wondering if there is any working way to transfer an existing NodeBB site to a new host, without losing any data. I've seen some posts on here regarding the same thing but they are considerably dated so I didn't know if there if there is any good way to do it for a recent installation.

Thank you.