WARP client on Apple phones blocks Roblox to open games

Hi all, still new to Cloudflare, this community etc. so sorry if this is a dumb/newbie error.

I have installed 1.1.1.1 client on my kids phone for the past year or so without any problems. The phones have connected with Gateway with Warp without any issues until approximately a week ago. Lately they haven’t been able to open any games within the Roblox app. If I change from connection “Gateway with WARP” to “Gateway with DoH”, the issues are gone.

Any idea what could cause the issue? A setting in Zero trust on Cloudflare side or a setting on Roblox side?.

All help would be highly appreciated.