I never heard a word from T Mobile but I seem to have solved this at least temporarily.  I had previously tried (and failed) to use a code I received in the mail but I tried again and this time it worked.  I gained access to my account and no longer receive the error message upon logging in.  I hope it continues to work but won’t be surprised if it doesn’t.  Good luck to the rest of you.

I have verified that my caller ID matches IRS records and the problem still exists for me.  I just got off the phone with T Moblle tech support for the past 2 hours.  They claim to be looking into this but I’ll be surprised if I ever hear anything.

I called T Mobile today and found out I had NO blocks on anything but I also discovered my outgoing caller ID was in someone else’s name.  Probably the last person to have my number.  I had it changed but the tech said it might not take effect for 72 hours.  I’ll try then and repost.

The IRS does provide an alternative ID method.  They will send you a code by “snail mail”.  Mine took about a week to arrive and it allowed me to create an account.  Unfortunately, the first time I tried to log into my new account I was asked again to provide a mobile number to ID myself and received the same error message.  So, that’s a dead end.

T~Mobile often blocks 3rd party short codes. You need to call snd ask that the block be removed. 

The last line of this message from the IRS says a code may also be sent over a phone.  If that were true none of us would be hare trying to solve this problem.  I did manage to get a code through the mail.  It allowed me to create an account.  The next time I tried to log into my new account I was AGAIN asked to provide my mobile number and so the problem repeats itself.  I still can’t get in.  I just found this message board so I will monitor it for a solution I haven’t tried.

FYI from IRS website: https://www.irs.gov/individuals/taxpayer-identity-verification-information#registrationerror

Text Messages

When you register for an IRS account, we will send a one-time activation code to your mobile phone number. Each time you log in to your account, we will send a security code by text message or phone call. Text messages from IRS Password Service originate from “77958” and message and data rates may apply. Phone calls originate from “202-318-5542.”

• When you receive the code, enter it quickly and accurately.
  • The code is only valid for 10 minutes. You can request a new code from the login screen. Note: you are limited to just a few attempts before you are locked out for 24 hours.
• If you didn’t receive the text message:
  • You may have opted out of receiving messages from IRS password service. Text IN to “77958” to resume service and receive the security code.
  • Your provider may be experiencing technical issues. Request a code via phone call from the login screen or try again later.

Note: Our call center can’t troubleshoot text message delivery issues. If you can't get a text message right now, you can get a security code via phone call.

Be careful with some MVNO's like mint, I got this hypothesis that caller ID has to be set to "your name" and by default they don't set it to a name at all...

what i found was the full name I used on my IRS forms did not match the ID name T Mobile uses for my account. I found I filled out the IRS with my middle initial, on T Mobile I do not use it. Lucking for me my wife does not have a middle initial so I retried with her name and was able to create an account. The big issue is the online IRS form does not have a place to enter the middle initial.

My guess is, if T Mobile allows it, change your account ID with your middle initial, and it should work.

I too was trying to verify with the IRS and it would not work.

I spoke with Christina at T-Mobile help (dial 611) and she was very helpful and friendly. She told me that the "short codes needed to be enabled".

Even that little bit of information took her awhile to find.

Just a heads up, the 1st rep I spoke with was "off shore" and tried to help but it took so, so long for her to even understand my question because of

English not being her primary language. She obviously kept giving me "canned" responses and somebody was directing her in the background. Save your time and avoid the frustration and ask for a U.S. rep.

Hope this helps.

Kind Regards,

Walter

Same thing happening to me and i do not know what to communicate to support person besides IRS can't validate my identity on post-paid account, someone mentioned "indicator" what indicator was changed?

Same problem with text messages from IRS.  I called T-mobile #611.  Explained the issue.  He did something with my account.  Totally fixed!  Received the IRS text.  Thanks a bunch!!!! 

2018.08.18.  I had the same issue.  Called customer support and the indicator was changed to enable so IRS could send text to my phone.  That is it!  You need to call T-mobile customer service #611.

Finally I was able to speak to a support representative. He asked me to use Internet Explorer (which I was using already), clear Temporary Internet Files and Cookies and try again. On the next try, it still failed to verify. He asked me to press Continue button which I faithfully did. The next screen informed me that my identity is verified and allowed me to create a userID and password. I'm going to have to wait for the Activation Code to arrive in the mail.

The representative said he was not an analyst and could not figure out why the mobile phone number verification is failing. He said they have been aware of the problem. I'm not holding my breath for the feds to fix it.

I hope some of this will help others.

That happened to my husband and me. The problem was a protection the government put on our accounts when our info was stolen from the Top Security Clearance rosters of the Office of Personnel Management (Yea, government computer security 😠 ). There was nothing to do, but go to the SSA offices and have it handled officially. It seems ANY credit monitoring can reek havoc on this authentication tool. 😉

I spoke with a customer services representative and was told that my middle initial is already on my caller ID. I've verified that it shows as Last name, First Name, Middle Initial. On the other hand, IRS registration service does not ask for middle initial.

I have confirmed that my account is postpaid.

The IRS registration presentation is at this site. Step by step registration process is here. This is what it says about mobile phone number:

A readily available mobile device. For instant access, your name must be associated with a U.S-based mobile phone capable of receiving text messages.  If the mobile phone number cannot be linked to your name, you may opt for a mailed activation code during registration.

My purpose of registration was to be able to get my tax transcripts online as explained here.

This is where I start registering for my account. Everything goes fine until I enter my phone number so they can send me a text message with verification code.

The error message says:

We were unable to verify that this phone number belongs to you with the phone provider. Please double check that your phone number was typed correctly or try a different number.  

IRS support number for e-Services registration is (866)255-0654, 1,2,1 with estimated wait time of 30-60 minutes. I'm currently on hold. As our illustrious President says, "Very Frustrating!".

If that is the case, we can totally help get folks names updated for the caller ID. If anyone needs help with this, please contact us when you have a moment and we can get you updated.

The name on the caller id must be you full legal name, match the IRS system.
It took a while before i got this figured out, since the name on the bill is my full legal name but the caller id was just my initial.

Good Luck!!

Same thing just occurred to me. I've been with T-Mobile for 10+ years with same exact number and IRS website cannot "verify my identity" with the number provided. What a joke.

Hey, @rmk9785e​!

Chris brought up a great question - how are they attempting to verify you? That might help us get to the bottom of what's going on.

I am not sure what information the IRS site is requesting when the verification is sent but when it comes to prepaid and postpaid accounts, when a prepaid number is converted to a post paid account, the old prepaid account is removed from our systems so there should not be anything hiding anywhere. Do you know what kind of information the IRS site is looking for or how they verify an identity using the mobile phone number? Is there a specific call back they are looking for from our network?

If you mean IRS by 'they', I doubt if they keep records of the type of accounts T-Mobile customers have. I suspect the old prepaid status may be hiding somewhere in T-Mobile system records which IRS checks to see the type of account one has. IRS does not have any consumer support option for registration to their online systems. They do have a phone number to support businesses. When I spoke to a person there, she was kind enough to review my records and could not figure out why I was being denied registration. Sadly, she said their applications are designed and tested to be compatible only with Internet Explorer even though they could work with other browsers. I tried accessing using IE and it was more responsive but still couldn't verify my identity with T-Mobile.

It is possible their records still indicate you as having a prepaid account and would need to be updated. I know finding a customer support option on their site might be a bit tough but did they provide any other ways of verifying?

Thank you. Checked that one too. It is a credit check postpaid account. Are any T-Mobile customers able to register at IRS web site?

Are you on a No Credit Check Post Paid?