After the iOS update to 11.6, OneDrive for Mac quits whenever one attempts to add another account via Preferences > Account > Add Account. I have seen some reporting that it is doing the same thing with accounts that use two factor authentication. What I can confirm is that it is happening with my business accounts.
Consider the following description of the app's issue: https://twitter.com/dwyer2008/status/1437936643621654537
Looking for any information re: a fix to be able to add a business/school account. TIA