iPad Authenticator App is Bla

Question

Between my work and personal life I have several iPhones/iPads and interact with people daily that also have iPhones and iPads. All of my devices and most of the devices owned by people I encounter have the Microsoft Authenticator app, which appears as a blue lock on a white background on every device I encounter and all of my devices save !; my personal 2021 12.9 in iPad Pro which displays the app as a blue lock on a black background. I have an identical iPad for work that has the common white background so it isn't the make or model. The device is fully,updated, I don't have any of those app editor or theme programs installed, and I download it directly from the App Store. I have deleted and redownloaded the app a dozen times, I've even wiped the whole iPad. Still the same. Any thoughts?