You are correct. " Yes, you can change the sentence to: Without their notifying the personnel office, they will be scheduled to take their vacation next year.
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Son JamesBut I think since there is "otherwise", the sentence doesn't need "unless".No, unless is essential.
Son JamesThe meaning of unless and otherwise are being overlapped.I think you are misinterpreting otherwise as under different circumstances. In the sentence, otherwise means something
Son JamesThen that means "otherwise" can be a kind of "noun phrase"?The Merriam-Webster Dictionary calls it a pronoun.
Cynthia3754You cannot use both unless and otherwise in this sentence. It is not correct.I’m afraid you’re misinterpreting otherwise. Please consult a