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MFA enrolment - telephone country codes

Hi - we’re in the process of building out a custom UI for MFA, as our scenario dictates that we can’t use the Auth0 provided MFA UI widget

As part of our SMS enrolment flow, we’d like to obtain telephone country codes to present to the user. Is there a way to obtain these from the Auth0 API somewhere? or are they integrated within the Auth0 MFA widget itself? My understanding is that the code for the MFA widget (“Auth0MFAWidget”) isn’t open source (correct?)