Verifying one drive message is shown

Hi Bhawna_123,

Thanks for posting in Apple Support Communities.

We understand that "verifying One Drive" shows on your Mac. To address this behavior. Open Activity Monitor and force quit CoreServicesUIAgent. This is likely related to verification of an application not quitting.

To quickly access Activity Monitor, search for it using Spotlight.

1. In the Activity Monitor app  on your Mac, under the Process Name list, select the app or process you want to quit. An unresponsive process is marked with (Not Responding).
2. Note: The Process Name list is not available in the Cache tab listings. 
3. Click the Stop button  in the upper-left corner of the Activity Monitor window (or use the Touch Bar).
4. Choose one of the following options:

• Quit: This is the same as choosing File > Quit within an app. The process quits when it’s safe to do so. If quitting the process could cause data loss or interfere with another app, the process doesn’t quit. 

• Force Quit: The process quits immediately. If the process has files open, you may lose data. If the process is used by other apps or processes, those apps or processes could experience problems.

• To see if a process is used by another process, choose View > All Processes, Hierarchically.

Quit an app or process in Activity Monitor on Mac - Apple Support

Regards.