Won't sync iphone Calendar IOS 13.5 to outlook 365 on Windows 10 pc using itunes
I'm using iTunes 12.10.7.3 to sync (USB) between Windows 10 PC Outlook 365 Calendar and iPhone IOS 13.5. After I make changes on my desktop Outlook program to the local Calendar, I can then run iTunes sync and all changes will be updated on the iPhone.
BUT, if/when I make a new or changed Calendar event item on the iPhone, iTunes does NOT sync those changes back to the pc. ???
I've tried different USB cables, and ports. All Windows 10 updates and iPhone updates current.
Any idea why it isn't working or how to fix? Thanks!
Windows, Windows 10