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I have several contacts in Outlook that are being reproduced multiple times on my iPhone (1928 Outlook contacts vs. 2456 iPhone contacts). I do not save contacts or email to iCloud but only use Exchange. How do I correct this problem? Thx.
Yes, this issue is on the iOS and under investigation on Apple's side, I suggest you to contact the Apple support to see if they could provide any help.
Here is a similar topic on apple support communities:
I understand that this issue is currently under investigation on Apple's side. If you can, please contact Apple Support to report this issue to them. And this point Microsoft is also looking into it for root cause analysis to expedite resolution for its customers.
You could find some useful information and suggestion in this link
Did you contact Apple support? If you need further assistance, please let me know. Thanks.