Hello @DCh 

Here are some tips that you could give it a try: 

1. Be sure that camera firmware and Tapo APP version are up-to-date;
2. Set camera on correct Time Zone by 'sync Location' as guide below or manually select correct time zone: How to Adjust Time Setting in the Kasa APP
3. Change router’s DNS to 8.8.8.8/8.8.4.4
4. Check if Modem / Router firewall  blocked UDP port 123 (for NTP server)

I hope that helps. By the way, is camera  in a different country or area?