Issue

“The desktop ‘xxxxxx’ is temporarily unavailable due to planned maintenance” error for a xendesktop VDI. Registration state shows registered, but for user it always shows the error.

Solution

1. Login to the desktop as Administrator.
2. Restart the Citrix Personal vDisk Service.
3. In Studio, check if Registration State is registered and PVD State is not failed.
4. If not, reboot the desktop and check both registration and PVD state again and then try to launch the desktop.

Citrix discussions says, a reboot of 4-5 times is required to clear this error. Search for your VDI in studio and registration state should be registered and in PVD tab, status should be ready.