@David-TP I am having the same issues with the homeshield controls blocking all YouTube access and even Apples App Store. It's not a very useful feature and worth the cost is nothing on my child's phone works. 

Was this issue resolved and how?  I have the same issue.  Limiting the restriction to 32 makes it impossible to add the sites that are needed to either be blocked or allowed.  It is also blocking valid and normally allowed general sites. Should allow the use of wildcards (*,  or ?, or +,) to allow to block keyword in the a domain for all the variations of sister sites. 

Appreciate a response on how to resolve.  

  @fons100 I'm not sure. I resolved it by going with a different router 🙃

TP-Link is a good consumer product and hopefully they will give their users more control over this in the future.

For now, you can do what I did and allow specific content delivery networks (CDNs), but in keep in mind that companies like Apple and Google may change which CDNs they use at any time. This is a workaround, not a fix.

Note: A CDN is a group of servers that deliver content. They are distributed over a large area (usually global) in order to provide quick access to content on the web.
 

HomeShield seems to be blocking CDNs and URLs specific to certain services. For example, ytimg.com is used for YouTube content, but HomeShield blocks it when adult restrictions are enabled. I'm not sure how TP-Link planned on delivering only safe content, it's not like you can content filter all of YouTube through a URL, but they claim to use AI, so maybe that was the plan.

Since your limited to allowing 32 domains (and can't specify which ones), you'll need to look at what's being blocked the most and research what it is. I'd provide a list of URLs I'd recommend allowing, but this forum won't let me post all the links. A quick web search can help you find out what most domains do and who they're owned by. Then allow the ones (at your own risk) that you think are necessary to fix your issue. This is a temporary solution and has severe limitiations.

That said, parental controls aren't very useful when it comes to the web. Many services are end-to-end encrypted, browsers have built-in privacy measures of their own (proxies, iCloud Private Relay), VPNs are available, devices spoof their MACs (Private Addresses on Apple devices), and kids will always find a way. If you're looking to keep kids from accidentally coming across content you don't want them to see, then this would be a great solution (if it worked), but if you want to deter or restrict access, you'll want to do that at the device-level.

  @AdminWes 

Thank you so much for the detailed post. I'm having the same experience and am looking to return the devices. This should be basic stuff. 

 OMG. Why on earth are the parental controls blocking known CDNs! Dang. I really wish I'd researched this more deeply before buying!