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Hi! My name is ***** ***** I will be assisting you today. Please note that the steps below may not resolve the issue initially but I am happy to assist you further if necessary.
Unfortunately, you likely downloaded Whatsapp previously with a different Apple ID then changed it.
When this happens, you cannot update the app without the old Apple ID. You would need to delete the app then download it again from the App store with the correct Apple ID.
Hold down your finger on the app until it shakes
Go into the App store and search for the app then install/download it