How to set up for pokemon go?

I try to guard my family devices with Cloudflare Zero Trust
I had done settings and installed each devices

After installing, my mother got not to login pokemon go on her iphone.
I found “pokemon go” in Gateway Firewall Policy, so I make Allow policy or No Inspect policy, but my mother can not play pokemon go

Maybe pokemon go app can connect to their servers, but its connection has not enough infomation to start game.
Please teach me how to set up for pokemon go.