I have a laptop that was running Windows 8.1 that I've recently upgraded to Windows 10 Pro. I had to delete my six year old son's local account because Child Accounts now have to be Microsoft accounts. That means changing his password to something that's going to be difficult for a six year old to remember, oh well.
I've got a couple problems now. The main thing my son used to do in his account was to watch YouTube videos. We did bing video searches for kid-friendly terms and would then pin them to the start screen. I'm able to do pretty much the same thing now, but he can't watch any of them. We can see the preview of the videos in a bing video search if we hover over them, but when we actually try to view them we just see a blank white square. Also, if I try to visit youtube.com by typing that in the address bar in Edge or IE it seems to run forever, almost like a DNS problem. This was with "block inappropriate sites" set to off in family settings. I've turned it on, but it didn't help.
With 8.1, it would filter some YouTube videos, but it would see a message on the screen to that effect. My recollection with 8.1 is that you could set various levels of blocking set, this seems to be gone now. In general the family settings in 8.1 offered much more control, but there's no message on the page. I'm afraid that if I add youtube to the allowed list, it won't block ANY youtube videos, which would be BAD.
Another problem I'm having is that Windows 10 seems to have lost the ability to ask a grownup for more time. I've allowed my son 1 hour per day (previously 45 minutes, but the new Family Settings time limits aren't as granular as before.) When he ran out of time in 8.1 it would offer me the chance to log in and give him more time. I've been eating up my son's computer time trying to troubleshoot these problems, but I haven't found any way to give him more time. The message that's displayed on the screen when he's running low on time implies that this is possible, but I don't see how.