@dyR  Hello, 

Please try this guide to troubleshoot SD card issue feel free to let us know if it works for you: 
What should I do if the SD card doesn’t work properly on my camera?
https://www.tp-link.com/en/support/faq/2749/

• If you have some trouble formatting SD card in the Tapo APP or camera reports any Error, please share a photo with us, thank you. 
• Verify if SD card is Fake (expanded capacity) with H2testw software and share a photo with us: (back up important files before run the test)

https://www.tp-link.com/en/support/faq/2592/

May I know the brand of your SD card as well, thank you in advance.