Cannot receive port-out transfer PIN by SMS while traveling abroad - need an alternative

I'm trying to port my Xfinity Mobile number out to another carrier and I need my number transfer (port-out) PIN, but I cannot receive it.

The problem: I'm currently traveling internationally. The transfer PIN is only delivered by SMS to my line, and that specific text never arrives here - even though normal verification-code texts DO reach my line, and international roaming is enabled (premium plan). This matches the PIN being sent from a short code, which does not deliver on international roaming. On top of that, the self-service "Transfer or cancel this line" page loads a blank white screen for me while abroad, and Wi-Fi Calling will not activate (Verizon backend error).

I have already contacted several chat agents and the phone line. Chat agents say the PIN requires verbal authorization they cannot provide; one promised to email it and it never arrived; the phone IVR just loops back to the self-service steps and will not connect me to a live person.

Could a specialist please verify my identity by direct message and either release the transfer PIN through a channel I can actually access, or arrange a callback that connects me directly to a live agent (not the IVR)? Number Lock is already off. Thank you.