Android Contacts on my phone not detecting duplicates even tho there are many

Samsung S21 Ultra
I use Nine as my email client on the phone and Outlook 365 on my laptops.
I open Contacts on my phone, tons of duplicates – 2 or more of each.
If I open the Contacts app on my Windows 10 laptop, no duplicates.

I got a few warnings about duplicates and fixed them.
But there are dozens and dozens more duplicates, and the phone Contacts app can’t find them.
I can manually delete them, so they seem to exist.

Why is this so badly broken?

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