E.D asking for computer passwords?

Hello! Recently our office staff (we are a small non profit so there’s not many of us) were given company computers, as we had to use our own personal laptops for a while. All of us were not able to create a log in account on the computer through out work Outlook accounts, as it said that our organization wasn’t set up with Microsoft Office fully or something like that, so we have all had to use our personal Outlook accounts as a log in for our work computers. Earlier this week, our boss asked all of us for our computer log in info. I am uncomfortable giving this info cuz like i said, it’s all our personal emails. Is this even legal? I’m in MI. Idk what to do cuz i feel like if I object to it then I’ll get reprimanded for it. Thanks!