Incredibly, this problem persists; I initially tried to access my software (Arturia demo) via ASC in September this year, but no joy. Contacted their support channel, got a BS stock response that completely ignored me stating that I CANNOT LOGIN via ASC, where it was suggested that I !!! login !!! in order to activate my software. I have now (7pm 30/11/20) purchased the full version of Pigments, which I have registered, downloaded and installed, but still cannot use due to the exact same issue; "Failed to sign in. Please retry" in ASC. I then tried the "offline activation" option, where you generate a "request file", which I did, and uploaded it at approx 7:30pm on 30/11/20, and now, 8:50pm on the same day I still have not received the promised email with the activation file I need to complete the offline activation.
I haven't experienced such a level of incompetence in many a year. How are these people still in business?!? I hear their hardware is fantastic, but unfortunately I've only experienced the web presence, and it is faaaar from satisfactory.