Authorization code flow with passwordless doesn't work


I have configured an Application as “REGULAR WEB APPLICATION”
Need to get authorization code with the passwordless flow.
passwordless/start - works (gets sms)
“client_id”: “{{client_id}}”,
“client_secret”: “{{client_secret}}”,
“connection”: “sms”,
“phone_number”: “{{phone_number}}”,
“send”: “code”,
“authParams”: {
“scope”: “openid”

/oauth/token - works
“grant_type” : “”,
“client_id”: “{{client_id}}”,
“client_secret”: “{{client_secret}}”,
“otp”: “{{otp}}”,
“audience”: “{{audience}}”,
“realm”: “sms”,
“scope”: “openid offline_access”

But, I need Authorization Code.
/authorize. ** says not authorized**

How to get the Authorization code using passswordless (SMS) flow?

Can you share how to get the Authorization Grant code?
(to excange for access token later)