I called 844 275-9310 today - 3/6/2022 - after days of frustration with the T-Mobile ID creation issue. The TMO rep was able to look up my account and verified me. She was then able to add my e-mail to my account (the one I used at the TMO store to activate my account). I was then able to finally create my T-Mobile ID. The 844-275-9310 TMO number is specific to their home internet service. Please give this a try - I share your frustrations as I was almost ready to give up.
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