This seemed to have worked for me... I tried logging in normally (many multiple times) by going to t-mobile.com and got the ‘uh oh’ message. Found this discussion to look for answers. Found no answers, so tried to add to the discussion by clicking in the reply text box. That opened up a new page where I was asked my security questions. Once answered I was able to get into my account. Hope that helps somebody. LOL this actually works.
I have the same issue :(
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