Cannot authenticate to CRM Online - ADFS Issue?

My client is using CRM Online, but is using ADFS locally so we have a redirect to the ADFS authentication form. So when trying to connect to the Service URL, I enter https://xxxxxx.crm.dynamics.com/XRMServices/2011/OrganizationData.svc using basic authentication. It returns an error that I could not be authenticated with those credentials. I know that if you enter that URL in the browser it will redirect you to the ADFS page; https://xxxx.xxxxxxxxx.edu/adfs/ls/?. How can I load this Service?

Things I have verified:

• The URL is correct. I can browse to it when already logged in to CRM Online.
• The credentials are correct. I put them in plain text and the to log in to CRM and used the same when trying to load the Service in Power BI.

thanks!
clint