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This link explains everything, solve the issue.
https://dev.to/veroca88/set-up-mongodb-atlas-and-connect-with-node-js-avoid-mongooseerror-operation-x-findone-buffering-timed-out-after-10000ms-5dpi
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add your current ip to your mongodb atlas
or
You have to stub your function, because it may be pulling directly from the
database.