Earlier this week, Apple released a minor update to macOS 10.15 with a few bug fixes including game centre, iCloud and some issues with installation.

Release Notes

This update:
– Improves installation reliability of ‌macOS Catalina‌ on Macs with low disk space
– Fixes an issue that prevented Setup Assistant from completing during some installations
– Resolves an issue that prevents accepting iCloud Terms and Conditions when multiple ‌iCloud‌ accounts are logged in
– Improves the reliability of saving Game Center data when playing Apple Arcade games offline

You can update your Mac by going to System Preferences > Software Update and then ‘Update Now’