Each license has a soft limit and a hard limit.

You can exceed the soft limit. PingOne will allow you to create identities beyond the soft limit, but will show a warning when the limit is exceeded. To discuss upgrading your license, contact Ping Identity Sales at www.pingidentity.com/en/company/contact-sales.html.

You cannot exceed the hard limit. PingOne will not allow you to create any more identities after reaching the hard limit.