(imported topic written by LukeFoelske)
There seems to be an issue with the migration.
Me and all of my co-workers cannot use our migrated accounts. I had to create a new one just to post (as nobody responded to my email).
(imported comment written by BenKus)
You might be having the issue listed at the bottom of the page here:
We are working to fix this… sorry for the inconvenience…