Difficulty getting started with Smartsheet API

Hi, Total API newbie here. I'm following the instructions in the "Make Your First API Call" section of the docmentation. I've generated a token, registered developer account, and I'm attempting to use curl to execute the:

curl -X GET -H "Authorization: Bearer <my auth token>" "https://api.smartsheet.com/2.0/sheets"

command, but it returns:

curl: (35) schannel: next InitializeSecurityContext failed: Unknown error (0x80092012) - The revocation function was unable to check revocation for the certificate.

I'm guessing I missed a step or twelve. Thanks for any assistance getting me off the ground.