“Archbishop” Vigano does not believe Francis is the valid Pope. He has made this abundantly clear from his many public expressions. He thinks that Francis has committed apostasy, that he is the head only of an anti-church and exercises only a false magisterium. And therefore he calls him “Bergoglio” and not Pope Francis. Then is constant attacks on the Pope show manifest grave and obstinate refusal of submission.
Vigano does not accept Francis as Roman Pontiff. That makes Vigano a schismatic who is automatically excommunicated. Therefore, Vigano has lost all jurisdiction as a Bishop and (former) successor to the Apostles. And he has no right to teach the faithful, nor to speak for the Church, nor to teach the Catholic faith.