can't waive a guy who's not on a major league contract. nottingham is a non-roster invitee. he did not finish the 2021 season on a major league roster or the major league injured list, nor does he have enough service time to have required an opt-out clause/retention bonus in his contract.
doesn't mean that he didn't negotiate an opt-out clause, but for the time being, we have to assume that nottingham is property of the orioles until the end of the 2022 minor league season. thus, he could be traded.