ComingUp is missing most Microsoft To Do lists. I have 30 lists but only 2 appear in the app.
This is a known Microsoft Graph API bug. The standard endpoint (/me/todo/lists) silently returns incomplete results. Microsoft's recommended fix is to use the delta endpoint instead (/me/todo/lists/delta).
I verified this by building my own integration - same account, same permissions. Standard endpoint returned 2 lists, delta endpoint returned all 30.
Microsoft Q&A thread confirming bug and fix:
learn.microsoft.com/.../microsoft-graph-todo-api-doesnt-return-all-task-li
Official delta endpoint documentation:
learn.microsoft.com/.../todotasklist-delta
The fix is a one-line change: replace /me/todo/lists with /me/todo/lists/delta and follow the pagination links in the response.