iCloud not working on iPhone

[katemith222]

Ways to Fix Messages in iCloud is Currently Disabled
Way 1: Force Restart your iOS Devices.
Way 2: Sign out of iCloud and Sign in Back Again.
Way 3: Turn on Two Factor Authentication.
Way 4: Reset Network Settings.
Way 5: Remove iOS 14/13 Beta or Update iOS 13

[Rhett]

Network restriction on your iPhone can lead to iCloud greyed out problem. Turn off restrictions by following the path – Settings > General > Restrictions > Accounts > Allow Changes. This should let you access iCloud Backup option.