Microsoft (work accounts) Website→

What doesn't seem to be a problem for personal accounts, is for work accounts from Microsoft (e.g. Office 365 etc.).

Maximum 16 characters. So forget about using your new fancy diceware password here - or really any secure passwords in general.

Oh - and besides that, please don't use any "exotic" symbols, like ¤ or €. Or the letters Æ, Ø or Å from the Danish alphabet. They all are supposedly "spaces".