When trying to login to the Nest, I get the error, "The credentials you provided cannot be determined to be authentic", what does this mean?

The error message, "The credentials you provided cannot be determined to be authentic" typically means that you did or did not use an upper or lower case letter when you needed to.  The SJU password is case sensitive so if you had upper case letters in your password, you must be sure you are using them to login.  See screenshot of the error.