[Safe Kids- can I block my kid's access to certain apps during online school time?]

Is it possible to block certain apps during specific hours?  I would like to block my kid's access to certain video game apps during the hours he supposed to be doing online school.  He needs access to web browser, school app, other websites, but I’d like him to have access to video games only between certain hours-- within his allotted time.  

[iphone app not controlling safe kids settings]

My iphone app does not seem to be able to control Safe Kids on my kids device.  I used to be able to adjust the amount of time they can use their devices from my phone, but now when I make changes on the app they do not register on my child’s devices  This seems to have started when I upgraded to the paid version of Safe Kids.  I’ve uninstalled and reinstalled the apps on both parent and kid devices.  Iphone is running ios 13.6, kid device is Windows PC running Windows 10.  I can work safe kids from the PC itself, but that is frustrating as the only thing I can do is pause safe kids entirely (and the time increments are really not ideal--- either 1 hour or 4 hours??)   At some point time I was able to enter a time limit (either from the phone or from logging on to the web- I’m not sure which.  ) and that seems to work, but I can’t make any changes to his time. He has also tried to send me a request for more time from the PC to my phone and I have not received it.