I've been trying to access the MyArchicad page to get the serial number of my educational license. When the page opens, i click the "login" button, log in using my credentials, and the page returns to the MyArchicad page, apparentelly without me being logged in, as the login button still shows up and my licenses don't appear.
From the description, it seems like 3rd party cookies was not allowed, thus the sign-in process via Graphisoft ID failed. Could you please make sure that it is enabled for the browser you are using and try again? Also, have you tried using another browser?
If that's the case, we will need some further investigation by our developers. To better understand the situation, is it possible for you to make a recording of the process (trying to sign in from MyArchicad site)?
Please let me know if you need a secure place to upload the video also.
Thank you very much for the report! With what Tomás has shared, I'm wondering if you are still having the problem? Can you access any other Graphisoft services, or only signing in through MyArchicad is affected?