Updated answer for 2024. It is still possible in this way: https://learn.microsoft.com/en-us/azure/active-directory-b2c/disable-email-verification?pivots=b2c-user-flow

1. Sign in to the Azure portal.
2. If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Azure AD B2C tenant from the Directories + subscriptions menu.
3. In the left menu, select Azure AD B2C. Or, select All services and search for and select Azure AD B2C.
4. Select User flows.
5. Select the user flow for which you want to disable email verification.
6. Select Page layouts.
7. Select Local account sign-up page.
8. Under User attributes, select Email Address.
9. In the Requires Verification drop-down, select No.
10. Select Save. Email verification is now disabled for this user flow.