If you have post-sign up jobseeker engagement enabled, you may get candidates applying for opportunities before they have been authorized.
However, if the candidate is then authorized by your team, all their past applications would be updated to show them as an authorized candidate within a maximum of approximately 15 minutes.
Depending on the assignment method you are utilizing on the platform, either clients would be notified (if they are assigning candidates), or the auto-hire process would proceed accordingly.