Medjugorje is still waiting approval. It’s wise to wait for approval as that means that there has been careful and prayerful scrutiny and discernment to “test the spirit”.
Sometimes the much maligned “authority” of the Church serves it’s appropriate role and purpose.
It is up to the local Bishop. And the Bishop of Akita approved the events.
One of the Supernatural aspects of Akita was that the statue had water streaming from the wooden eyes of the statue. These were found to be human tears -- by Japanese scientific investigation.
Additionally, the Nun [Sister] involved in the apparitions was deaf. She was temporarily cured of her deafness, then permanently cured of her deafness.
There is a website that states what apparitions are approved and not approved.
But even Pope Benedict [nor Pope John Paul when he was alive] could intervene in these matters. They could issue an opinion. But it up to the local Bishop in these matters.
There is another web site with a list of approved and unapproved apparitions: