IT Professionals,
In mid-November, Microsoft 365 will be retiring support for iOS 13 and MacOS 10.14 on the To Do iOS and Mac apps respectively. At that point, the To Do app will only work on devices that have upgraded to higher versions (14 and above for iOS and 10.15 and above for Mac). If automatic upgrades are not set up on your device, refer to the upgrade instructions for iOS and for MacOS.
For reference, refer to the system requirements for To Do apps.
–IT Community Partnerships on behalf of Microsoft 365