Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I'm having this same issue.
I updated the app on my iMac Catalina. now it refuses to open.
Updated to 2.112
I've deleted the following folders and reinstalled the app.
~/Library/Application Support/Microsoft/To Do/
~/Library/Containers
~/Library/Group Containers
I now get the sign-in screen to type my username and it asks if its a work/personal account. I click personal and I get the error message
"Microsoft To Do quit unexpectedly"