The profile in the iPhone devices can cause issues with wireless network hence removing the profile can fix the problems. The method includes the solution for iCloud Backup Greyed Out.
1. Tap to open the Settings of your iOS device.
2. Go to General section and go to the Profile.
3. Delete the listed profiles.
4. Now check the settings if the iCloud Backup can be enabled.
For Office Installation: office.com/setup
The Network Restrictions on iPhone could be another reason for iCloud Greyed Out the problem.
1. Open the Settings app on your iPhone.
2. Tap the General option.
3. Go to the Restrictions option.
4. Tap the Accounts button and proceed to Allow Changes.
5. Check if the problem is existing or not.
To know more detail about this article or office setup visit www.office.com/setup