I experience the same problem: Error e0703a “Could not retrieve the list of licenses. Invalid credentials” messages when logging in.
Disconnecting from the internet helps, but this means that I need to disconnect each time I want to log in - and this is not really convenient.
When I try to sigh out, I got Error e0720a: Logout failed. Authorization error while attempting to release device.
Would complete uninstalling and then reinstalling be a solution in such case?
By the way, I observed that the above problem appeared after I tried to change my email address from cloud/support webpage. I did not succeed in changing the email (it is still old - one I indicated when registered), but it triggered above described problems of logging in and out.