This seems to be a theme of late… Microsoft retiring features and applications for various reasons. The latest retirement is the Microsoft Lists mobile application in iOS and Android, and it’ll be completely shut down by mid-November, 2025. There is no reason listed as to why, but I’m going to guess that the mobile app for Microsoft Lists never really gained the traction they expected when they released Microsoft Lists as a whole. To be clear, this doesn’t affect Microsoft Lists in general… only the ability to access and use it on the mobile app.
Here’s the information provided by Microsoft: