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Just worked for me (my.t-mobile.com) from Firefox for Linux. I have seen this error before and typically just try again in a few minutes and it usually works. If it persists, you may want to call 611 and ask for technical support and open a support ticket (and be sure to get the ticket number, agent name and request a follow-up call - good luck with all of that! ;-).
I tested my account and I'm able to get in. I'm using Google Chrome. You could try giving that a shot and seeing if that helps. If you still need some help, you should use the suggestion above and have a ticket filed for this.
Hey there! Were you able to get logged in to your account yet?
Howdy! Hopefully this has ironed itself out by now, but I wanted to check in here and see how things were going just in case you're still having trouble! Please let us know if you haven't been able to log in at this point.