how do I remotely sign out of my iPhone from iCloud web page?
how do I sign out of devices using iCloud web page?
iPhone 12 mini
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Navigate to https://appleid.apple.com/ and sign in. Select Devices and pick the account in question. At the bottom should be a button labeled "Remove from account". This will remove all iCloud and Apple service access and remove all Apple Pay data as well.
If you don't need to erase it, this should be all you need to do. If you'd like to read more into it, here's a article about clearing data from your iPhone and other devices.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support