Getting a 400 error response when requesting a session token for the Notehub API

If you are following the directions here:
https://dev.blues.io/reference/notecard-walkthrough/inbound-requests-and-shared-data/#adding-inbound-notes-with-the-notehub-io-api

but the response from Notehub is

400 bad request, cannot be fulfilled ...

then the request is using an invalid username and password combination.

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