dwardzala
In case anyone else is having difficulties getting an error message when you try to activate - cut and paste the link into your browser instead of just clicking on the link in the email.
Sorry if this is obvious and/or posted above, but I did not see it on first pass and it took me a few minutes to figure it out.
^THIS^ is what FINALLY worked for me.
I started out trying to log in as normal to the forum - no luck. I then tried the "Lost Password" button, entered my user name and it came back with "user does not exist" (which naturally was a surprise, I'd always kind of assumed I existed though it does explain some of the people I meet). At this time I realized that we HAD to migrate so I selected the migrate button, filled everything out and, eventually, got it to send me the authentication email.
I clicked on the migrate authentication link from Outlook and it didn't work. Then I tried right-clicking, selecting "Copy Hyperlink" then pasting into the address bar of Chrome and that did NOT work (it kept saying I had broken the internet). I then tried the "Lost Password" button which worked this time and sent me a new password. I attempted to log in using that but it kept saying invalid combination of user name and password.
FINALLY I saw the comment above and gave it a try carefully scraping the whole link, hitting Ctrl-C, then pasting it into Chrome's address bar and... it finally validated me.
I just hope that the less-tech savvy members find this thread and figure things out!