Failed to sign in on iPad after updating to 26.52

After updated to 26.52, I cannot play Realms, access Marketplace and profile page. So, I deleted the game and download it again. After that, I login using my account. But when the login process is finished, it shows “Failed to login” with “Error Code: Tuff” even though my username is still displaying. This problem only occur on my iPad Air (5th generation) but not with my iPhone 17 with both having iOS 27. It is very unlikely to be connection issue because both device are connected are the same WiFi and my iPhone can still access everything including Realms and Marketplace normally.

(The local world can still be played normally without logging in)