Random apps not working when connected to wifi works fine when connected via mobile data

[varuncool252]

Hey everyone i own a simple setup with a modem and a router 

Sometime ago after hearing about Cloudflare DNS and its features i decided to use their app in my phone and everything worked fine 

Now when i needed to use a separate vpn i googled how to make that dns default in the router and made it everything worked fine until one day i decided to watch some netflix in my Mobile phone and strangely it did not load

i own a MI A1 i tested in that device it did not work i checked it in other mobile devices too same issue occurred the other device was OnePlus 5t (both run android pie(stable) idk if this is relevant)  i went through the forums of these devices and noticed no such problems it is to be noted that i did not face any of these issues before i switched to the DNS of cloudflare in my router and modem and thinking that might be causing the issue i reset both my modem and router hoping that would solve the issue but nothing happend 

Anyone know what might be causing the issue

The apps i noticed to not work are

1}Netflix

2)Amazon Prime Music

3)PhonePE

IDK if there are more apps facing the same issue apps like prime video and youtube work just fine 

 

Please help in finding a solution 

 

I can attach any document necessary 

 

Please note i live in India so if you requested anything i might be asleep (blame TimeZones) i will surely give them when i am up

Thanks in advance 

[TooUnskilled]

For Netflix at least, I've heard they have measures against VPN to block people accessing content that's not available in their own country.