Mfa/associate error ["error_description": clientID cannot be null, "error": server_error]

Help
,
1

Hi ,

I am trying to enroll second MFA using mfa/associate, but getting below error

[“error_description”: clientID cannot be null, “error”: server_error]

Please help

2

Is there any example for enrolling additional MFA as said in this URL
https://auth0.com/docs/api/authentication?http#add-an-authenticator

Please share any iOS code.