It often happens that Facebook advertising cabinets are blocked, and documents such as a passport must be provided to unlock them.
However, this process does not guarantee 100% unblocking and may take about 28 hours.
If, after sending the documents, the FB has not unblocked the cabinet, you can try to send other documents until it passes verification and receives an unblocked account.
(previously it was possible to submit documents as much as you like, now there is only one attempt)
In addition, passing the verification and unblocking the advertising cabinet increases the trust of the Facebook robot and increases the trust of the account.
This reduces the likelihood of subsequent blockages and makes it easier to launch ads.
