His boss 'assured' him that he had her continued support. = His boss 'assured' him of her continued support. = “You have my continued support,” his boss 'assured' him.
You can 'rest assured' [=you can be sure] that these mistakes won't happen again. = 'Rest assured', these mistakes won't happen again.
They are not 'assured of' being paid. [=it is not certain that they will be paid]
(..) The Vikings! Egbert, where would Morgana be? The safest place... the tower chapel. Odin! Be assured, sire. The second drawbridge is much stronger than the first. Take your magic elsewhere, holy man. The chapel is a sanctuary. (..)1958 The Vikings
(..) is of the true royal line... and welcome his succession to the throne. Your Majesty. Thank you, my gracious lady. You may rest assured that the barbarians... that murdered your husband, my cousin... will soon feel the weight of my anger. (..)1958 The Vikings