It's working for me on my phone.
Have you turned off: Settings > Network & internet > VPN > AdGuard > Block connections without VPN? AdGuard vpn only wants to tunnel DNS requests through the VPN, but having this on means other traffic gets stuck.
If that's not it, have you tried other connections, like 4/5G? Also, I seriously doubt AdGuard is blocking anything, but have you tried loading the app with AdGuard disabled (including forgetting the VPN from settings).