I am looking to implement signup with the flexibility of either using the email id or phone number as one of the required fields. The authentication API indicates that email is mandatory. There was another post which indicated there might be another way to get around this by creating a fake email id, but that is something I am not keen to look at. Just wondering if there is any other solution I am missing?
Also I am not looking at signin – so Passwordless signin is not for me. I only want this above option in signup and then use the same set of credentials (email/phone + password) for sign ins.