No, that's not possible. If you are using a relational database you could add a unique constraint yourself though.

On 11 May 2016 at 16:46, Guus der Kinderen <guus.der.kinderen@gmail.com> wrote:
Hi all,

Is it possible to have multiple realms, in which every username is unique across all of the realms?

Regards,

  Guus

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