TrustFrameworkExtensions.xml

// Part of the file

<ContentDefinition Id="api.localaccountsignup">
...
  <Metadata>
    <Item Key="DisplayName">Local account sign up page</Item>
  </Metadata>
  <LocalizedResourcesReferences MergeBehavior="Prepend">
    <LocalizedResourcesReference Language="en" LocalizedResourcesReferenceId="api.localaccountsignup.en" />
  </LocalizedResourcesReferences>
</ContentDefinition>

<Localization Enabled="true">
  <SupportedLanguages DefaultLanguage="en" MergeBehavior="ReplaceAll">
    <SupportedLanguage>en</SupportedLanguage>
  </SupportedLanguages>
  <LocalizedResources Id="api.localaccountsignup.en">
    <LocalizedStrings>
      <LocalizedString ElementType="UxElement" StringId="ver_fail_no_retry">Attempt limit exceeded - please check your email for the correct code</LocalizedString>
    </LocalizedStrings>
  </LocalizedResources>
</Localization>

// Both are these are inside the <BuildingBlocks> section

https://medium.com/the-new-control-plane/customising-the-message-error-text-in-azure-ad-b2c-custom-policies-d1e1ff2640d3

@rbrayb when i am uploading the the custom policy ,its throwing following error
Validation failed: 1 validation error(s) found in policy "B2C_1A_TRUSTFRAMEWORKEXTENSIONS" of tenant "DistCompliance.onmicrosoft.com".Schema validation error found at line 10 col 6 in policy "B2C_1A_TRUSTFRAMEWORKEXTENSIONS" of tenant "DistCompliance.onmicrosoft.com": The element 'BuildingBlocks' in namespace 'http://schemas.microsoft.com/online/cpim/schemas/2013/06' has invalid child element 'ContentDefinition' in namespace 'http://schemas.microsoft.com/online/cpim/schemas/2013/06'. List of possible elements expected: 'ClientDefinitions, ContentDefinitions, Localization, DisplayControls' in namespace 'http://schemas.microsoft.com/online/cpim/schemas/2013/06'.,

kindly suggest