Does Tello require KYC, that is, is the eSIM linked to an actual identity ?
As least in Europe (psd2) that’s the key for accepting a phone number as a 2FA method
All of my 2FA Mules[1] are USMobile SIMs attached to pseudonyms which were created out of thin air.
It helps a lot to run your own mail servers and have a few pseudonym domains that are used for only these purposes.