My Parallels Tools did not install, reinstall, or update on my virtual machine.

Symptoms
Some or all of the following features do not work properly in the virtual machine:

Mode of coherence view
Drag and Drop
Mouse Synchronization via Copy and Paste
Synchronization of Time
Synchronization of the Clipboard
Resolution in Motion
Folders that are shared
Shared Applications and Profiles
Printers and other devices that are shared
Resolution
General troubleshooting is simple; simply follow the instructions step by step.

Basic (the most common)

1.In the Mac menu bar, locate the Parallels logo and select Actions > Reinstall Parallels Tools.

2. Parallels Tools will start updating; once finished, click Restart to restart the virtual machine and finish the installation.

Extensive (if the first method did not help)
Save (back up) the current state of your virtual machine by clicking on the Parallels logo > and selecting Take snapshot on the Mac menu bar.