I am getting a 401 response when hitting the Power BI login page! https://app.powerbi.com/?noSignUpCheck=1
jstearnes,
What web browser do you use? I would recommend you clear cache and password history of your web browser, then sign in https://app.powerbi.com/.
Also you can use private window of your web browser, then sign in Power BI Service.
Regards,
Lydia