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“”Except the Church teaches that the angels did not possess the Beatific Vision when they rejected God, right?””

Saint Thomas Aquinas explains this well

SIN OF THE FALLEN ANGELS

1. A rational creature (that is, a creature with intellect and will) can sin. If it be unable to sin, this is a gift of grace, not a condition of nature. While angels were yet unbeatified they could sin. And some of them did sin.

2. The sinning angels (or demons) are guilty of all sins in so far as they lead man to commit every kind of sin. But in the bad angels themselves there could be no tendency to fleshly sins, but only to such sins as can be committed by a purely spiritual being, and these sins are two only: pride and envy.

3. Lucifer who became Satan, leader of the fallen angels, wished to be as God. This prideful desire was not a wish to be equal to God, for Satan knew by his natural knowledge that equality of creature with creator is utterly impossible. Besides, no creature actually desires to destroy itself, even to become something greater. On this point man sometimes deceives himself by a trick of imagination; he imagines himself to be another and greater being, and yet it is himself that is somehow this other being. But an angel has no sense-faculty of imagination to abuse in this fashion. The angelic intellect, with its clear knowledge, makes such self-deception impossible. Lucifer knew that to be equal with God, he would have to be God, and he knew perfectly that this could not be. What he wanted was to be as God; he wished to be like God in a way not suited to his nature, such as to create things by his own power, or to achieve final beatitude without God’s help, or to have command over others in a way proper to God alone.