401 error message

Every time I try to save my score to the cloud or publish it online, it gives me an error message that says "error code: 401 authorization required." I assume this means I need to be signed in, but that's the problem. Not only do I have an open tab on my browser of Musescore.com that I am signed into, I am also signed into the application. Am I doing something wrong? How do I fix this so I can save my score to the cloud?