The official Nintendo Switch Online app has been updated to the latest version across all supporting iOS and Android devices. Read on below for the full release notes: What’s New in Version 1.5.2 (iOS) - Bug fixes implemented. What's New in Version 1.5.3 (Android) - Fixed an issue that prevented logging in on certain devices.
Nintendo Switch Online update version 1.5.3 now live on Android
Nintendo & Pokémon Blog 