@Caty-secur_63 

Hi,
You can refer to the instructions below to share your Tapo device on the Tapo app.
How to share my Tapo Smart Devices with my family?
 

If you fail to share your Tapo device, please check if the below tips are helpful.
    1. Ensure your Tapo app is up-to-date.  If it isn't, try uninstalling the app and reinstalling it to see if that helps.
    2. Check that both your phone and the smart device you want to share have an active internet connection. If not, restart your router and the smart device for a try.
    3. The email account you share the smart device with should be a TP-Link account. If not, refer to the instructions to register a TP-Link account: https://www.tp-link.com/support/faq/1439/

Best Regards