To troubleshoot this issue, try the following methods:
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Log out of WeChat and log in again.
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WeChat supports simultaneous login on a phone and the WeChat website for Windows/iPad. However, if you want to log in on another device, ensure you log out from the previous device.
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Power off your phone for 5–10 minutes to clear the cache and restart it.
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Close any security apps running on your phone.
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Update to the latest version of WeChat.
If you are repeatedly prompted with this message, take the following actions after logging in to WeChat:
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Link your mobile number to your account.
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Change the password for WeChat, your linked QQ account, or linked email address.