To do not syncing with outlook / OneNote tasks

Hello

I have a M365 personal account. I create Outlook tasks in OneNote 2016 , which then sync to Outlook.

However , they do not the sync with my To Do app.

I’m logged into both correctly . The only thing I can think about is that my registered email is using gmail. However , I wouldn’t have thought that too be an issue.

Any help appreciated. Thanks