Playing with Microsoft CIAM
https://learn.microsoft.com/en-us/entra/identity-platform/custom-extension-tokenissuancestart-setup?tabs=visual-studio%2Cazure-portal&pivots=azure-portal https://learn.microsoft.com/en-us/entra/identity-platform/custom-extension-tokenissuancestart-configuration?tabs=azure-portal%2Cexternal-tenant