Incorrect synchronization between Outlook Tasks and iOS Reminders

Question

If on Windows devices the standard app for tasks is Outlook (or Microsoft ToDo), then for iOS devices the standard app for tasks is Apple build “Reminders”.

Between Outlook tasks (Microsoft ToDo) and iOS Reminders, there is synchronization of tasks and it works not bad, but there are two small issues. I want to show them to you in a five-minute video with I made simultaneously on iPhone, iPad and Laptop for clarity. So watch these videos at the same time. It's faster than explaining them in text. 

https://www.dropbox.com/sh/qn3e5jk9yylg38m/AACEa7fII_23JdDpOC21A2PEa?dl=0

1. When I change the due date on to-do.live.com/tasks (or on Outlook tasks or on Microsoft ToDo) of any task from “today" to “no date" — synchronization time from “today" to “no date" on iPhone and iPad don't change!
   2. After I delete all reminders from to-do.live.com/tasks (or from the iPhone) - they are not deleted from the iPad. Even if we wait whole day, nothing will be removed.
   To reduce your time, I want to inform you that I have been writing about these 2 issues of synchronizing Microsoft ToDo support for a whole year :( And these issues has long been known, poor synchronization between Microsoft and Apple protocols. But Apple support says that the problem is on the Microsoft side. Resolve these issues please