If your WhatsApp account has been logged in to an unknown or other device (Linked Device), then you can easily log it out from your phone forever in just 1 minute.
For this, follow the easy steps given below:
Open the WhatsApp app on your phone.
Android users: Click the three dots (⋮) in the top right and go to Settings.
Click on the Settings option given at the bottom right.
In Settings you will find the option of Linked Devices, tap on it.
Here you will see a list of all the computers or tablets where your WhatsApp is open.
Click on any unknown or suspicious devices you see. Then, tap the Log Out option in the pop-up window.
Doing so will immediately remove the unknown device from your WhatsApp account and revoke its access. For security, be sure to also turn on two-step verification on your WhatsApp.
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