修正方法は iOS の設定 -> OneDrive で一番下の「アカウント情報のクリア」を行う
OneDrive への再ログインが必要になる
しかし、再び KeePassium から OneDrive 上のデータベースにアクセス可能
情報源
OneDrive sync stopped working after iOS update
iOS updates seem to affect offline caching in OneDrive. As a result, a perfectly working KeePassium starts freezing when trying to access a database in OneDrive.To fix this, open device settings, scroll down and select OneDrive. Then, toggle the Clear Account Settings switch. This will clear the cache and reset your installation of OneDrive. You will need to login to OneDrive again, and re-add your database to KeePassium.
