Hey byfbi4wy0zty,
While your network may be secure, this type of error typically points to a general connection issue. You can try switching between WiFi and mobile data if possible, or try testing on a completely different network (WiFi at a separate location).
You've likely tried several of these, but just to be sure, it may also help to restart your phone, toggle airplane mode on/off, and make sure you don't have any active VPN, private DNS, or ad blocker while launching or running the game. If all else fails, you can also clear the app data and then reinstall to force a fresh connection.
Just be sure you've linked your account to save your progress before removing or reinstalling!