At the moment there is no option to authorise super payment without text message code authorisation. When I am out of the country I do not have phone contact unless turning on data roaming which come...
This is not just an MYOB problem. I have a dual sim phone and when overseas I turn off the Aust sim. When I need 2FA for anything (MYOB, some super funds, banking etc etc) I turn on the Aust sim (roaming always on) and receive the coded needed to proceed. My cheap Optus plan does not charge for text messages received so there is no additional costs. After code received I turn off the Aust sim