@Mon_chat 

Hello,

Thank you for sharing the details on the TP-Link community. Based on your description, we’d like to clarify and suggest the following for further investigation.

1. Please confirm whether the affected Tapo C210 can still be added and configured successfully in the Tapo app. If the camera is able to come online temporarily, we recommend checking whether a newer firmware version is available and updating it to see if this improves stability.

2. Please try resetting the camera and connecting it to a different Wi‑Fi network for testing, such as another router or a mobile phone hotspot. This helps determine whether the issue is related to the current network environment.

If the camera still goes offline when connected to a different Wi‑Fi network, we recommend reaching out to the local tech support, so they can work with you in looking into this further or help with the warranty checking:
https://www.tp-link.com/support/contact-technical-support/#Hotline-Support