Updated firmware to v04.05.00-342 the desktop app MyCloud Login failed to allow me to enter my user name, when I click on it the box turns blue with a drop box and doesn’t allow me to enter the user name. It does allow for the password which does not work on it’s own.
The Desktop program has been End of Life since 2016. There is the following WD Support Knowledgebase article covering this issue.
My Cloud Desktop App No Longer Works with a My Cloud or Login Not Authorized