Validation error when uploading localized custom user attribute in Azure AD B2C - azure-ad-b2c

Question

I'm trying to localize a custom user attribute named Hobby in Azure AD B2C.
This is the definition of the attribute in the user flow:
According to the docs here:
https://learn.microsoft.com/en-us/azure/active-directory-b2c/language-customization?pivots=b2c-user-flow#change-extension-attributes, the localization should be done by adding the following element to the resource file:
{
"LocalizedStrings": [
{
"ElementType": "ClaimType",
"ElementId": "extension_<ExtensionAttribute>",
"StringId": "DisplayName",
"Override": true,
"Value": "<ExtensionAttributeValue>"
}
[...]
]
}
So I added the following to the top of the file (as the first item of the LocalizedStrings array):
{
"ElementType": "ClaimType",
"ElementId": "extension_Hobby",
"StringId": "DisplayName",
"Override": true,
"Value": "Passatempo"
},
However, when uploading the file back to B2C, I keep getting the following error:
1 Validation errors found in upload overrides for
api.signinandsignupwithpassword1.1. Please ensure that your uploaded
resource matches the template: The localized string with ElementType:
ClaimType, ElementId: extension_Hobby and StringId: DisplayName is not
a valid override.
No matter how I try to modify the snippet (lowercase / uppercase, remove the "extension" part, etc.) - I can't make it work.
What am I missing? Why doesn't it work?
Thanks!

Answer 1

I tried to reproduce the same in my environment and got below results:
I created custom user attribute named Hobby via Graph Explorer using below query:
POST https://graph.microsoft.com/v1.0/identity/userFlowAttributes
Content-type: application/json
{
"displayName": "Hobby",
"description": "Your hobby",
"dataType": "string",
}
Response:
I added this custom user attribute named Hobby like below:
When I ran the user flow and selected Sign up now, I got the screen asking for Hobby like below:
To localize this custom user attribute, I added the following as the first item of the LocalizedStrings array like below:
{
"ElementType": "ClaimType",
"ElementId": "extension_Hobby",
"StringId": "DisplayName",
"Override": true,
"Value": "Passatempo"
},
Json file:
When I tried to upload this file, I got the same error as you like below:
To resolve the error, you need to download valid resource file i.e., Local account sign up page like below:
Find hobby in that downloaded file and modify it like below:
{
"ElementType": "ClaimType",
"ElementId": "extension_Hobby",
"StringId": "DisplayName",
"Override": true,
"Value": "Passatempo"
},
Json file:
When I uploaded that file to Local account sign up page in User flow, it overrode successfully like below:
Now, I ran the user flow by enabling Localization as below:
When I selected Sign up now, Hobby changed to overridden value successfully like below:
Please note that, you can only override values which appears on that specific page. You will get Hobby on Sign up page. So, you need to modify Local account sign up page.