[Montana_Sam]

I thought in the Catholic Church a priest can absolve ANY sin.

(My explanation is not very good, but it will give you an idea of the situation.) A priest has to have the permission of his bishop to perform absolution. The bishops of the SSPX have been separated from the authority of the Church, and so they did not have the authority to grant their priests the authority to forgive sins. As you note, a priest with the facility to forgive sins can forgive pretty much any sin that a repentant sinner confesses. Am thinking there may be one or two situations that only a bishop can resolve, but am not 100% sure about that.

[RobbyS]

Technically they are out of communion with the Church of Rome. But that does not break the line of succession.

[ZULU]

Ok. Now I get it. Thank you.