Azure Active Directory B2C Phone Sign Up/Sign In Filter to Certain Countries

Question

I've currently setup Azure Active Directory B2C for users to sign in via a phone OTP. I need to limited the phone numbers to be only countries the application is supported in.

I've not found a way to do this yet or any documentation on this.

NB* this is not the MFA it's login via phone number.

Answer 1

Hi @Michael Ridland ,

To limit the country list in Phone Sign In/Sign Up in Azure ADB2C User Flow does not provide country list in default Json File.
To update the country, drop down list with selected countries you need to update the JSON page of Phone Sign in.

To update the Phone Sign in page,

1.Click Your User Flow

2.Languages -> Click 'Enable Language Customization' in the menu if it's not enabled

3.Select the language

4.Click phone signin page in flyout menu and download the defaults json

5.Then add this in the end of json file

"LocalizedCollections": [
    {
      "ElementType": "ClaimType",
      "ElementId": "countryCode",
      "TargetCollection": "Restriction",
      "Override": true,
      "Items": [
        {
          "Name": "India(+91)",
          "Value": "IN"
        }
      ]
    }
  ]

and upload the JSON to reflect the changes.

Hope this will help.

Thanks,

Shweta

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