todo not syncronizing

Question

Microsoft To Do has not synchronized correctly for my account for approximately 3 days.

My Android phone still contains all my existing To Do data and lists. My wife can see all shared lists and all their tasks normally.

However, my account does not synchronize correctly:

To Do on the web initially showed “We are getting your task lists ready” indefinitely.

The normal browser session still does not show the task contents.

An Incognito browser session partially loaded some old task contents, but then stopped.

My shared lists show no members on my account, while my wife still sees me as a member.

Changes I make do not synchronize to my wife.

Changes my wife makes do not synchronize to me.

The problem occurs on both Android and the web.

The problem has persisted for approximately 3 days.

I have NOT deleted the To Do app, cleared its data, removed any lists, removed sharing, or logged out, because my Android phone still contains the intact task data.

Please investigate the server-side Microsoft To Do synchronization and shared-list membership state for my account.

I am concerned about losing or overwriting the existing task data, so please do not recommend deleting local app data or reinstalling the app unless you can confirm that the server-side data is intact and synchronized.