Taize received the approval of Bl. John Paul and Catholics are allowed to join the Taize community and make vows in that community.
They do not answer to the Sacred Congregation for Institutes of Consecrated Life and Societies of Apostolic Life, because they are an ecumenical community, not Catholic. If I’m not mistaken, they may be the oldest and certainly the largest ecumenical community that has the blessing of the Holy See. One has to understand that the blessing of the Holy See does not give them a canonical place in the Church. The Catholic monks have a canonical place. They remain fully Catholic and in full communion with the Church. The blessing of the Holy See simply means that Catholics may join them. This came about, because they have never been anti-Catholic. In fact, they were one of they were the second Protestant group that welcomed Catholics without giving them a hard time about their faith. They have always prayed for dialogue and reunification.
When you visit the Taize monastery, you find that they have a daily Catholic mass for the Catholic monks and retreatants. The monks celebrate the Liturgy of the Hours in common, profess the evangelical counsels, live a structured community life, and there monastic life patterns itself on that of the early Carmelites. They are a cross between monks and hermits, as were the Carmelites before the 13th century.
The current Abbot is a Latin Rite Catholic and the founder was Lutheran. Most of their vocations come from the Lutherans, Catholics and Anglicans. They have a very close relationship with the Franciscans and the Missionaries of Charity. They always supported Mother Teresa in many ways. She visited them when she could do so. Brother Roger was often a guest of Bl. John Paul. I don’t know the details, but from the many pictures together, including traveling together, one gets the impression that Br. Roger, Mother Teresa and Bl. John Paul were good friends and shared a hope for Christian unity and peace. Brother Roger was also the most outspoken Protestant leader against the ordination of women, same-sex marriages, abortion, euthanasia and the unjust application of capital punishment. He was a strong supporter of Evangelium Vitae, which is required study for the monks in formation at Taize.
Pope Benedict XVI gave Holy Communion to Brother Roger twice, once at the funeral of Bl. John Paul and the other time at his installation. Brother was one of the guests of honor. This is allowed by Canon Law. A bishop may grant permission for a non-Catholic to receive Holy Communion, provided that the person believes in the real presence and meets the other conditions in the canon. There was nothing illegal about this. The same privilege was granted to Tony Blair before his admission to the Church. I say privilege, because the only people who have a right to receive Holy Communion are Catholics and Orthodox. For everyone else, it’s a privilege that must be granted by a bishop or the pope and it’s not to be taken lightly. That’s why it’s rarely granted.
Even though they have Catholic monks at Taize and at least one of the monks is ordained, they do not have intercommunion. That is not allowed by their constitution. They have a deep respect for the rules of the Catholic Church.
I think that they strike us as very strange, because we have very few Protestant religious orders and Protestant monasteries in the USA. They are more common in Europe. American Protestantism is much more secularized than European Protestantism, with the exception of the UK. I’m never sure what they’re going to do next.

However, even the UK has pockets of very traditional Benedictine and Franciscan houses that are on the edge of Anglicanism. With the changes going on, I would not be surprised to see many of these communities reunite with their Catholic brothers.
Fraternally,
Br. JR, OSF