Problem Statement/Rationale

Attempting to follow the "Authenticate after Connection" instructions in step 3 of the X.509 docs results in an error:

> db.getSiblingDB("$external").auth({mechanism: "MONGODB-X509"})
MongoshInvalidInputError: [COMMON-10001] auth expects user document with 'user' and 'pwd' fields

Steps to Reproduce

Follow the instructions in the docs linked above and choose the "Authenticate after Connection" option rather than "Connect with Authentication".

Expected Results

Authentication succeeds.

Actual Results

Authentication fails with the error shown above.

Additional Notes