How can I log in to my T-Mobile account without a T-Mobile line of service that includes a phone?

Turning off 2-step verification does not always assuredly provide the T-Mobile customer with the ability to log into their online, T-Mobile account using only their email address and password. Too often, the system will still ask to send a confirmation code to a T-Mobile phone number.

If I only have a T-Mobile home Internet account, my T-Mobile Internet device will receive a confirmation code to use for logging into my T-Mobile online account via a laptop computer.

But, if I only have SyncUp devices on my T-Mobile account, I cannot receive a text message from T-Mobile on those devices. How do I log into my T-Mobile account if I only have SyncUp Trackers as my T-Mobile devices? I want to be able to check my billing information, order status and account settings from my laptop's web browser.

I have been working on this problematic issue, enlisting the assistance of T-Mobile technical support, for months. I must continue to pay for a T-Mobile line of service that includes a phone just for the privilege of being able to log in to my online T-Mobile account. The confirmation code cannot be sent to the email address associated with my T-Mobile account, nor can the code be sent to a non-T-Mobile phone number. Google authenticator still requires an active phone number, and that number must be associated with a T-Mobile phone device. Using an alternative T-Mobile ID does not solve the issue.

Does anyone have a solution to this quandary?