I attempted to setup something within the Internal Revenue Service system that required verification of my phone number, seemingly via text message. I entered all 10 digits as required. The IRS system failed and indicated it was not able to verify my number. It stated within the setup instructions that landline numbers and Google Voice numbers could not be verified but nothing about MVNOs in general.
I do not have a problem receiving texts otherwise but I suspect due to the sensitive nature of the setup that the IRS system is doing more in depth verification with my number than just trying to send a text.
Anyone have a similar issue or have any idea what might be the root cause?