I saw an old post thats almost a year old with no answers, so I'm starting a new thread. 

I have 3 C425 cams, 7 C120's and 2 C100's. I cannot download clips on any of them. They all started erroring on the same day (6/1/25). Before that, they all worked. All of my cams and phones are on the same 2.4ghz network - the only 2.4ghz network I have.

I've been communicating for days with tech support and they dont seem to be able to figure this out. I'm 99% sure its a bug or network protocol issue on their side. I've tried 2 different iPhones and an Android phone and they all get the same error. 

With the help of ChatGPT (no groans please) I have gone through hours of troublshooting. Ive gone through all of my routers settings, no issues. I've explored everything to do with WiFi settings on all of the phones, no issues. 

BTW, I have done a total reset on 2 cams and added them as new. The problem disappears on them. 

Is this happening to anyone else??

ChatGPT says:

"This points to a software side credential/token or network cache corruption, either:

       A change in how the Tapo app or Cloud verifies local vs remote, or

       A corrupted local authorization state tied to the existing cameras in the app

On the day this started, something (like a Tapo app update, firmware push or router policy security change) broke local network recognition of the previously added cameras, perhaps invalidating their local access token or LAN registration.