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]
(..) ROLAND: I know. And I have made every effort to make sure that, if the Duke should fail, Paris will still be well defended. Your Highness should be assured that you are not completely dependent on a Northman. I rather like being dependent on a Northman. They tend to tell the truth. (..)2016 TvShow: Vikings Title: The Last Ship Season: 4 Episode 10