You may see the error message “Waiting for this message. Check your phone” on your linked device in place of a message you sent or received. So, you might need to wait for the message to arrive on your linked device. This may happen if you or the person you are chatting with recently reinstalled WhatsApp or are using an older version.
To resolve this:
- Check your telephone to see the message.
- Ask the person you are messaging to open WhatsApp on their phone.
- Make sure you are both using the latest version of WhatsApp.