curl --request GET \
  --url https://saas.pads365.com/rdx/NDS.Services.Credentials/api/v1/credentials/user-registration/{azureAdUserId}

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "UserRegistration": {
    "Id": "<string>",
    "OAuthUserId": "<string>",
    "OAuthUsername": "<string>",
    "Email": "<string>",
    "AppRegistrationId": "<string>"
  }
}