Removing device from the iCloud itself
If I removed my iPhone 8plus from my iCloud account,would I then be able to sing into the device with another iCloud account
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As per the article https://support.apple.com/en-in/HT205064
Permanently remove a device from your account page
If you're still signed in with your Apple ID on the device, it might reappear on your account page the next time your device connects to the Internet. To permanently remove the device from your account page, sign out of iCloud, iTunes & App Stores, iMessage, FaceTime, and Game Center on that device, or erase that device.
After erasing the device sign in with new Apple ID and password on the iPhone .