I can't sign out my iCloud

"I can’t sign out my iCloud"

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This may be Locked to a User Account:

Is this a Used Device? If so, the original user would need to enter their information. If you created this with a previous Apple ID, then you'd have to log in with that. This is the link that the seller should have used prior to selling it to you (or whatever is the case): What to do Before you Sell, Give Away, or Trade in your Mac - Apple Support

"I can’t sign out my iCloud account"

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Contact Apple Support:

If you can’t sign out of your own Apple Account, then you should contact Apple Support for assistance. There may be issues syncing to Apple’s servers.

• Contact Us - Choose Locations
• Proceed from there as necessary
• Note: Phone calls are taking a bit to go through at the moment, due do lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)