https://www.tplinkcloud.com/register.php click "already have a non-activated account?..." You will receive another email to activate your account.

Yes TPlink says there is plan.

Contact tplink support to get a clue.

Does your router interface look like this one? https://www.tp-link.com/en/faq-651.html

FYI https://www.tp-link.com/en/faq-1531.html Be careful that internet access time indicates the time that the parental control rule takes effect, it doesn't necessarily mean you can access internet...

Have you change wireless settings like channel? That may help. https://www.tp-link.com/us/faq-2292.html Is firmware the latest? BTW, do you have any google home device connected to the router? To get...