The Save Contacts setting is enabled on multiple iOS devices, such as an iPad and an iPhone. The Save Contacts setting is enabled for your Outlook account. Your Outlook contacts might be affected by this issue if the following conditions are true:
This issue tends to occur frequently if you have a large list of contacts. If the Save Contacts setting is enabled in Outlook for iOS, duplicate Outlook contacts might appear in the native iOS Contacts app on your device. Duplicate Outlook contacts appear in iOS Contacts app
