So it seems I completely lost cloud access to my controller. It works locally, as whole network is rock-solid - I can log on its address, which is 192.168.0.100.

TP Link cloud access is enabled, account is binded. Internet works. I rebooted twice. Deleted the controller from the app and add it again. Ubinded TP-Link account from cloud access, re-binded it. Issue still persist.

Similar error in the android app.

Any ideas?