This may be caused by a recent update.
Open the Settings App, go to Windows Update - Update History.
What is the KB number of the most recent updates installed on your PC.
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The Calendar and Notification panels do not open when I click the date and time on the taskbar in my primary user account. However, when I signed in with another user account (Test account), both features worked normally, indicating that the issue is specific to my user profile.
This may be caused by a recent update.
Open the Settings App, go to Windows Update - Update History.
What is the KB number of the most recent updates installed on your PC.