user acount must meet credentials

Is it possible that i set some credentials for new user regisration?

For example users must always start with company number like:

aa-nameofoffice

No, this is not possible as

No, this is not possible as standard. Your questions implies that your try to host several company on a single server, so maybe what you need is to look into ejabberd virtual hosting: https://docs.ejabberd.im/admin/guide/configuration/#virtual-hosting

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