https://wccftech.com/microsoft-office-for-ipad-gets-support-for-dark-mode-on-ipados/

Microsoft has finally updated its Office apps for iPad and iPhone with dark mode support. These apps include Word, Excel, PowerPoint, OneNote and Outlook. The company had originally announced plans to add a dark theme to all its Office apps and the transition seems to have completed with this update.

OneDrive was one of the first Microsoft apps to gain support for iOS 13 and iPadOS' native dark mode. The company did a brilliant job with the theme and it received a lot of positive feedback.