grouped mobile contacts show twice in outlook2016 client

[Windows Central Question]

if I add a contact to a group on my Lumia 640 DS this contact appears twice on my sychronized outlook 2016 desktop client. I'm using Windows 10 on mobile and desktop (latest updates). One desktop contact is the original, the other one is a copy with a category name of the group. Is there an option/a way to avoid the duplication of the contacts on the client when using groups on the Lumia?
Thank you for response.
By the way: I'm using the German version in Germany.
::roland

 

[Chintan Gohel]

if I add a contact to a group on my Lumia 640 DS this contact appears twice on my sychronized outlook 2016 desktop client. I'm using Windows 10 on mobile and desktop (latest updates). One desktop contact is the original, the other one is a copy with a category name of the group. Is there an option/a way to avoid the duplication of the contacts on the client when using groups on the Lumia?
Thank you for response.
By the way: I'm using the German version in Germany.
::roland

in outlook, outlook options > people > is the box for do not show duplicates checked?

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[Snow_surfer]

as you can see the option is on - since I started Outlook.
hope that helps
::roland

PS
just to support the translation from German to English: the option in the third row of the 2nd paragraph says "check on duplicate contacts when saving" (my free translation)

 

[Chintan Gohel]

View attachment 128957

as you can see the option is on - since I started Outlook.
hope that helps
::roland

PS
just to support the translation from German to English: the option in the third row of the 2nd paragraph says "check on duplicate contacts when saving" (my free translation)

That was the only thing I could think of,