Windows 11 home system embedded calendar cannot add events

I just upgraded to Windows 11 home, but I found the right bottom corner calendar cannot add event and cannot display the events. It works before I upgrade the system.

Steps I do:

1. Left-click the right bottom corner TIME area in the task bar;

2. It pop up the calendar.

3. I want to review the events that I added with my hotmail account and I want to add events(it can also synchronized to my hotmail account) too, but it doesn't work anymore. I don't want to open the CALENDAR APP as it is not convenient to do so.

Can anyone tell me what I should do so that I can easily add to do/event with the embedded calendar instead of opening the calendar APP?

Thanks in advance!