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Azure Policy
An Azure service that is used to implement corporate governance and standards at scale for Azure resources.
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@Olayinka Olarewaju Thank you for reaching out to us. As I understand you want to achieve this ask "Is it possible to block certain domain in ADB2C Sign-up Userflow" - with Userflow it is not possible, this is possible using custom policy. A complete sample is provided here: https://github.com/azure-ad-b2c/samples/tree/master/policies/sign-up-domain-allowlist
Let me know if you have any further questions.