Based on those messages I can't tell exactly what's failing, but there's a debug= option you can place on the LIBNAME statement to get more information in the SAS log. When you add debug=on you should see a filename statement generated in the log window. Can you use the url found in the log on your browser? If you get an error there, that implies a problem with the API key (too short, expired, etc.).
If the url works from the browser, and the debug= information does not help you determine root cause for the failure, then the debug= info is helpful for SAS Technical Support (me), along with the results of this code:
%put _automatic_;
Feel free to post back the results of the above tests or email them to support@sas.com to create a tracking entry with Tech Support so that I or someone on my team can do more research and offer you feedback.