How is this not fixed yet? This thread is over 3 yrs old, yet the problem continues. I can deal with crappy coverage, but I should at least be able to get TFA codes while on wifi! I was able to get this resolved by contacting T-Mobile technical support. It was a chat session, and they were able to reset a setting.
2-factor auth codes from Amazon.com and Vanguard.com do not work with my t-mobile phone. Others work fine. In fact, they work fine with my spouse’s phone, and she is also a t-mobile customer - with the exact same phone!
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