I have exactly the same issue as you.
My computer is NOT new and my 365 is approximately 3 years old and I have been using the Classic Outlook.
As mentioned by others
- i cannot schedule an appt for any time other than 8am in the morning thru clicking on the calendar/using new appt
- I cannot modify the time through the pull down arrows.
- The problem began in the early part of November. Prior to that the many appts I was scheduling had no issues.
There are workarounds but they are a nuisance
- you either must leave your microsoft device and enter your appts via Apple Iphone or Ipad [not sure about everyone else but I chose a windows based computer for a reason - don't particularly want an apple]
- you have to do the activity twice [ie enter the appt and details then save, then go out to the day view on outlook and drag it into position.} If you are scheduling many appts [which i am for medical reasons] the appts need to be accurate and having the extra work is undesirable.
I would like to know what is being done to resolve the issue