Sign out from iCloud is greyed out even though no restrictions are set

Hi, same happend to me with my son’s iphone 6, ios 12 with screen time activated.

Needing to send the iphone for a repair, I wanted to log him out of icloud. This options was greyed out. I changed the permissions. No succes.

Finally I switched of screen time for my son through my own iPad. This worked: now I was able to log him out on his own iPhone.

Screen time + restrictions is the solution here

Had basically the same thing happen to me. Purchased 2 iPads for my children for Christmas and connected both children's Apple IDs to Family Sharing and the accounts are each setup as a child account. With each child logged into their own iPad with their own Apple ID, I was unable to log them off. As originally posted... Sign Out button in Settings->Apple ID is greyed out and there is a text "Sign-out is not available due to restrictions". I have numerous restrictions set for my children, including disallowing account changes and passcode changes. I initially thought this was part of the problem and toggling those restrictions to "allow/enable" resulted in no change in behavior.

The details provided by Bassert24 worked for me with one slight change... through my own iPhone, I turned off screen time for each of my children. I then had to restart both children's iPads. After this, I was able to successfully log each child off of the iPad.

Welcome to the Apple Support Communities!

If I understand your question, you have purchased a new iPhone for your son and restored all of his data to the new iPhone from an iCloud backup for his specific Apple ID account. Is that right? If that's the case, if you want to "release" your son's iPhone from iCloud, you can restore the old iPhone to factory settings. This will erase everything on the device and it can then be set up as a new iPhone. Before you do that, go to www.iCloud.com and remove the iPhone from the Find My iPhone app. The resources below will help you with this.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch
Restore your iPhone, iPad, or iPod to factory settings​
Take care.

I too have this same question. It doesn't have anything to do with getting rid of or selling a child's iphone/ipad. If I have a 2nd iPad that I have logged in as the same account as my child to monitor iMessage's/Facetime, I am unable to log out of the iPad (short of wiping it). I messed with the content restrictions as well, however I could never log out. I have two children. I'd like to be able to log into both of their Family accounts (child) to monitor Facetime/iMessage's easily and switch back and forth. I did end up wiping the device, and of course that worked.

That's the exact dilemma that I have. My children have their iPads, while their mother uses an iPhone. I carry an Android device. I am actively evaluating a product called Mobicip (https://www.mobicip.com/) that will allow both Android and IOS devices to control the iPads. I'm not far enough into it to make a recommendation BUT I've spoke with their tech support team and made the purchase ($40 per year). Apple's Screen Time looks fantastic conceptually BUT it seems to be plagued with issues/bugs. For example, the devices should be locked out after 8PM and also after 3 hours of use per day. I have found that if ANY YouTube video has been watched that day, the 8PM and 3 hour accumulated usage is bypassed/overridden. My hope is that the two apps, working in conjunction with one another, will accomplish what I want with the devices. I do like the fact that Screen Time can b configured to where my kids have to request for an app to be installed. I have both units locked down pretty good. I'd rather err on the side of caution when it comes to accessing the internet and apps.

After wiping it, then re-trying the same steps. I was able to turn off "screen time," then it allowed me to log out of the ipad and log back in with my 2nd child's icloud account.

I have been searching all over the internet for the solution to this. I finally found it 2 days later! Thanks so much!

What if you don't have another Apple device? Can you sign them out through Android?

Yes turning off screen time is what worked. Thank you so much.

if you reset the ipad to factory settings will you loose all your apps?

Thanks Apple