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We have a similiar requirement in <PROJECT_NAME>. But the solution for us is to query the LDAP that actually is used to log in users about known users. But that’s merely an implementation detail of the environment where we are deploying to.
I also don’t think it’s the responsibility of UAA to provide this kind of feature.
Another solution I can think of is to use Keycloak with user federation and A12 user management. Then you can query A12 user management about known users using A12 apis. But this depends on whether you are allowed/authorized to configure a keycloak instance with user federation.