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                        Duplicate in supported cultures list
Trying to upload 'policies\custom-email-verifcation-displaycontrol\policy\DisplayControl_TrustFrameworkExtensions.xml'
Duplicate in supported cultures list: https://www.screencast.com/t/OZEbY9jAjP
But this validation error occurs.
Ran into this also: https://www.screencast.com/t/datz69FZP
Dear @rosidigital
Replace Append  in <SupportedLanguages DefaultLanguage="en" MergeBehavior="Append"> to ReplaceAll
Also, read an important note just before the section Add Azure AD B2C claim types.
Thanks @kengaderdus
@rosidigital The changes in Custom email verification with SendGrid article have not gone live. You will have to wait a little bit.
However, you can see this note:
We recommend that you use a sample Custom email verification custom policy available on GitHub. DisplayControl_TrustFrameworkExtensions.xml uses TrustFrameworkExtensions.xml as its base file hence make sure to include TrustFrameworkBase.xml, TrustFrameworkLocalization.xml and TrustFrameworkExtensions.xml files from the SocialAndLocalAccounts starter pack in your policy.
Thanks.